diff --git a/secp256k1/secp256k1.c b/secp256k1/secp256k1.c
index a0c5cee9..3b9ac575 100755
--- a/secp256k1/secp256k1.c
+++ b/secp256k1/secp256k1.c
@@ -179,10 +179,14 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO(arginfo_secp256k1_ec_pubkey_negate, IS_LONG
     ZEND_ARG_TYPE_INFO(1, ecPublicKey, IS_RESOURCE, 0)
 ZEND_END_ARG_INFO();
 
-ZEND_BEGIN_ARG_INFO(arginfo_secp256k1_ec_privkey_tweak_add, 0)
+#if (PHP_VERSION_ID >= 70000 && PHP_VERSION_ID <= 70200)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO(arginfo_secp256k1_ec_privkey_tweak_add, IS_LONG, NULL, 0)
+#else
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO(arginfo_secp256k1_ec_privkey_tweak_add, IS_LONG, 0)
+#endif
     ZEND_ARG_TYPE_INFO(0, context, IS_RESOURCE, 0)
-    ZEND_ARG_INFO(1, seckey)
-    ZEND_ARG_INFO(0, tweak32)
+    ZEND_ARG_TYPE_INFO(1, seckey, IS_STRING, 0)
+    ZEND_ARG_TYPE_INFO(0, tweak32, IS_STRING, 0)
 ZEND_END_ARG_INFO();
 
 ZEND_BEGIN_ARG_INFO(arginfo_secp256k1_ec_pubkey_tweak_add, 0)
@@ -191,10 +195,14 @@ ZEND_BEGIN_ARG_INFO(arginfo_secp256k1_ec_pubkey_tweak_add, 0)
     ZEND_ARG_INFO(0, tweak32)
 ZEND_END_ARG_INFO();
 
-ZEND_BEGIN_ARG_INFO(arginfo_secp256k1_ec_privkey_tweak_mul, 0)
+#if (PHP_VERSION_ID >= 70000 && PHP_VERSION_ID <= 70200)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO(arginfo_secp256k1_ec_privkey_tweak_mul, IS_LONG, NULL, 0)
+#else
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO(arginfo_secp256k1_ec_privkey_tweak_mul, IS_LONG, 0)
+#endif
     ZEND_ARG_TYPE_INFO(0, context, IS_RESOURCE, 0)
-    ZEND_ARG_INFO(1, seckey)
-    ZEND_ARG_INFO(0, tweak32)
+    ZEND_ARG_TYPE_INFO(1, seckey, IS_STRING, 0)
+    ZEND_ARG_TYPE_INFO(0, tweak32, IS_STRING, 0)
 ZEND_END_ARG_INFO();
 
 ZEND_BEGIN_ARG_INFO(arginfo_secp256k1_ec_pubkey_tweak_mul, 0)
@@ -999,11 +1007,11 @@ PHP_FUNCTION(secp256k1_ec_privkey_tweak_add)
     int result = 0;
 
     if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rz/S", &zCtx, &zSecKey, &zTweak) == FAILURE) {
-        RETURN_FALSE;
+        RETURN_LONG(result);
     }
 
     if ((ctx = php_get_secp256k1_context(zCtx)) == NULL) {
-        RETURN_FALSE;
+        RETURN_LONG(result);
     }
 
     if (Z_TYPE_P(zSecKey) != IS_STRING) {
@@ -1074,11 +1082,11 @@ PHP_FUNCTION(secp256k1_ec_privkey_tweak_mul)
     int result = 0;
 
     if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rz/S", &zCtx, &zSecKey, &zTweak) == FAILURE) {
-        RETURN_FALSE;
+        RETURN_LONG(result);
     }
 
     if ((ctx = php_get_secp256k1_context(zCtx)) == NULL) {
-        RETURN_FALSE;
+        RETURN_LONG(result);
     }
 
     if (Z_TYPE_P(zSecKey) != IS_STRING) {
diff --git a/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error2.phpt b/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error2.phpt
index c871685c..60afe7d9 100644
--- a/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error2.phpt
+++ b/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error2.phpt
@@ -14,11 +14,9 @@ $keyTweak = str_repeat("A", 32);
 
 $context = tmpfile();
 $result = secp256k1_ec_privkey_tweak_add($context, $key, $keyTweak);
-echo gettype($result) . PHP_EOL;
-echo ($result ? "true" : "false") . PHP_EOL;
+echo $result . PHP_EOL;
 
 ?>
 --EXPECT--
 secp256k1_ec_privkey_tweak_add(): supplied resource is not a valid secp256k1_context resource
-boolean
-false
\ No newline at end of file
+0
\ No newline at end of file
diff --git a/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error3.phpt b/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error3.phpt
index 87206333..057fa42b 100644
--- a/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error3.phpt
+++ b/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error3.phpt
@@ -13,11 +13,9 @@ $key = str_repeat("A", 32);
 $keyTweak = str_repeat("A", 32);
 
 $result = secp256k1_ec_privkey_tweak_add();
-echo gettype($result) . PHP_EOL;
-echo ($result ? "true" : "false") . PHP_EOL;
+echo $result . PHP_EOL;
 
 ?>
 --EXPECT--
 secp256k1_ec_privkey_tweak_add() expects exactly 3 parameters, 0 given
-boolean
-false
\ No newline at end of file
+0
\ No newline at end of file
diff --git a/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error4.phpt b/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error4.phpt
index 4abccb8c..9457c0d6 100644
--- a/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error4.phpt
+++ b/secp256k1/tests/secp256k1_ec_privkey_tweak_add_error4.phpt
@@ -22,4 +22,4 @@ try {
 
 ?>
 --EXPECT--
-secp256k1_ec_privkey_tweak_add(): Parameter 2 should be string
\ No newline at end of file
+secp256k1_ec_privkey_tweak_add(): Parameter 2 should be 32 bytes
\ No newline at end of file
diff --git a/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error2.phpt b/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error2.phpt
index a91ed720..909ed21b 100644
--- a/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error2.phpt
+++ b/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error2.phpt
@@ -14,11 +14,8 @@ $keyTweak = str_repeat("A", 32);
 
 $context = tmpfile();
 $result = secp256k1_ec_privkey_tweak_mul($context, $key, $keyTweak);
-echo gettype($result) . PHP_EOL;
-echo ($result ? "true" : "false") . PHP_EOL;
-
+echo $result . PHP_EOL;
 ?>
 --EXPECT--
 secp256k1_ec_privkey_tweak_mul(): supplied resource is not a valid secp256k1_context resource
-boolean
-false
\ No newline at end of file
+0
\ No newline at end of file
diff --git a/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error3.phpt b/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error3.phpt
index a1fe1825..40dd2ef1 100644
--- a/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error3.phpt
+++ b/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error3.phpt
@@ -10,11 +10,9 @@ if (!extension_loaded("secp256k1")) print "skip extension not loaded";
 set_error_handler(function($code, $str) { echo $str . PHP_EOL; });
 
 $result = secp256k1_ec_privkey_tweak_mul();
-echo gettype($result) . PHP_EOL;
-echo ($result ? "true" : "false") . PHP_EOL;
+echo $result . PHP_EOL;
 
 ?>
 --EXPECT--
 secp256k1_ec_privkey_tweak_mul() expects exactly 3 parameters, 0 given
-boolean
-false
\ No newline at end of file
+0
\ No newline at end of file
diff --git a/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error4.phpt b/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error4.phpt
index d4969c60..770c8f04 100644
--- a/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error4.phpt
+++ b/secp256k1/tests/secp256k1_ec_privkey_tweak_mul_error4.phpt
@@ -7,8 +7,6 @@ if (!extension_loaded("secp256k1")) print "skip extension not loaded";
 --FILE--
 <?php
 
-set_error_handler(function($code, $str) { echo $str . PHP_EOL; });
-
 $context = secp256k1_context_create(SECP256K1_CONTEXT_SIGN | SECP256K1_CONTEXT_VERIFY);
 
 $secKeyFirst = 1;
@@ -22,4 +20,4 @@ try {
 
 ?>
 --EXPECT--
-secp256k1_ec_privkey_tweak_mul(): Parameter 2 should be string
\ No newline at end of file
+secp256k1_ec_privkey_tweak_mul(): Parameter 2 should be 32 bytes
\ No newline at end of file
diff --git a/tests/Secp256k1PrivkeyTweakAddTest.php b/tests/Secp256k1PrivkeyTweakAddTest.php
index 1f8d397a..22133c05 100644
--- a/tests/Secp256k1PrivkeyTweakAddTest.php
+++ b/tests/Secp256k1PrivkeyTweakAddTest.php
@@ -37,40 +37,4 @@ public function testTweaksPrivateKeyAdd($context, $privkey, $tweak, $expectedTwe
         $this->assertEquals($privkey, $expectedTweaked);
 
     }
-
-    public function getErroneousTypeVectors()
-    {
-        $context = TestCase::getContext();
-        $tweak = $this->pack('0af79b2b747548d59a4a765fb73a72bc4208d00b43d0606c13d332d5c284b0ef');
-        $privateKey = $this->pack('0af79b2b747548d59a4a765fb73a72bc4208d00b43d0606c13d332d5c284b0ef');
-
-        $array = array();
-        $class = new self;
-        $resource = openssl_pkey_new();
-
-        return array(
-            array($context, $privateKey, $array),
-            array($context, $privateKey, $resource),
-            array($context, $privateKey, $class)
-        );
-    }
-
-    /**
-     * @dataProvider getErroneousTypeVectors
-     * @expectedException \PHPUnit\Framework\Error\Warning
-     */
-    public function testErroneousTypes($context, $seckey, $tweak)
-    {
-        $r = \secp256k1_ec_privkey_tweak_add($context, $seckey, $tweak);
-    }/**/
-
-    /**
-     * @expectedException \Exception
-     */
-    public function testEnforceZvalString()
-    {
-        $tweak = $this->pack('0af79b2b747548d59a4a765fb73a72bc4208d00b43d0606c13d332d5c284b0ef');
-        $privateKey = array();
-        \secp256k1_ec_privkey_tweak_add(TestCase::getContext(), $privateKey, $tweak);
-    }
 }
diff --git a/tests/Secp256k1PrivkeyTweakMulTest.php b/tests/Secp256k1PrivkeyTweakMulTest.php
index fb1cfc9f..7022614c 100644
--- a/tests/Secp256k1PrivkeyTweakMulTest.php
+++ b/tests/Secp256k1PrivkeyTweakMulTest.php
@@ -34,40 +34,5 @@ public function testTweaksPrivatekeyMul($context, $privkey, $tweak, $expectedTwe
         $result = secp256k1_ec_privkey_tweak_mul($context, $privkey, $tweak);
         $this->assertEquals(1, $result);
         $this->assertEquals($privkey, $expectedTweaked);
-
-    }
-
-
-    public function getErroneousTypeVectors()
-    {
-        $context = TestCase::getContext();
-        $tweak = $this->pack('0af79b2b747548d59a4a765fb73a72bc4208d00b43d0606c13d332d5c284b0ef');
-        $privateKey = $this->pack('0af79b2b747548d59a4a765fb73a72bc4208d00b43d0606c13d332d5c284b0ef');
-        $array = array();
-        $class = new self;
-        $resource = openssl_pkey_new();
-        return array(
-            // We only test the second parameter here, first is a Zval
-            array($context, $privateKey, $array),
-            array($context, $privateKey, $resource),
-            array($context, $privateKey, $class)
-        );
-    }
-    /**
-     * @dataProvider getErroneousTypeVectors
-     * @expectedException \PHPUnit\Framework\Error\Warning
-     */
-    public function testErroneousTypes($context, $seckey, $tweak)
-    {
-        $r = \secp256k1_ec_privkey_tweak_mul($context, $seckey, $tweak);
-    }/**/
-    /**
-     * @expectedException \Exception
-     */
-    public function testEnforceZvalString()
-    {
-        $tweak = $this->pack('0af79b2b747548d59a4a765fb73a72bc4208d00b43d0606c13d332d5c284b0ef');
-        $privateKey = array();
-        \secp256k1_ec_privkey_tweak_mul(TestCase::getContext(), $privateKey, $tweak);
     }
 }