diff --git a/src/Type/Php/StrContainingTypeSpecifyingExtension.php b/src/Type/Php/StrContainingTypeSpecifyingExtension.php
index 8cf678ae56..1f1a0e168e 100644
--- a/src/Type/Php/StrContainingTypeSpecifyingExtension.php
+++ b/src/Type/Php/StrContainingTypeSpecifyingExtension.php
@@ -66,7 +66,7 @@ public function specifyTypes(FunctionReflection $functionReflection, FuncCall $n
 			[$hackstackArg, $needleArg] = self::STR_CONTAINING_FUNCTIONS[strtolower($functionReflection->getName())];
 
 			$haystackType = $scope->getType($args[$hackstackArg]->value);
-			$needleType = $scope->getType($args[$needleArg]->value);
+			$needleType = $scope->getType($args[$needleArg]->value)->toString();
 
 			if ($needleType->isNonEmptyString()->yes() && $haystackType->isString()->yes()) {
 				$accessories = [
diff --git a/tests/PHPStan/Analyser/nsrt/non-empty-string-str-containing-fns.php b/tests/PHPStan/Analyser/nsrt/non-empty-string-str-containing-fns.php
index 12d3495098..5640194266 100644
--- a/tests/PHPStan/Analyser/nsrt/non-empty-string-str-containing-fns.php
+++ b/tests/PHPStan/Analyser/nsrt/non-empty-string-str-containing-fns.php
@@ -14,6 +14,13 @@ class Foo {
 	 */
 	public function strContains(string $s, string $s2, $nonES, $nonFalsy, $numS, $literalS, $nonEAndNumericS, int $i): void
 	{
+		if (str_contains($s, 0)) {
+			assertType('non-empty-string', $s);
+		}
+		if (str_contains($s, 1)) {
+			assertType('non-falsy-string', $s);
+		}
+
 		if (str_contains($s, ':')) {
 			assertType('non-falsy-string', $s);
 		}