diff --git a/vlib/builtin/result.v b/vlib/builtin/result.v
index 395a83ba08effb..74ba8098f97271 100644
--- a/vlib/builtin/result.v
+++ b/vlib/builtin/result.v
@@ -5,10 +5,6 @@ module builtin
 
 // IError holds information about an error instance
 pub interface IError {
-	// >> Hack to allow old style custom error implementations
-	// TODO: remove once deprecation period for `IError` methods has ended
-	msg  string
-	code int // <<
 	msg() string
 	code() int
 }
@@ -43,10 +39,6 @@ pub fn (err IError) str() string {
 			(*err).str()
 		}
 		else {
-			// >> Hack to allow old style custom error implementations
-			// TODO: remove once deprecation period for `IError` methods has ended
-			// old_error_style := unsafe { voidptr(&err.msg) != voidptr(&err.code) } // if fields are not defined (new style) they don't have an offset between
-			// <<
 			'${err.type_name()}: ${err.msg()}'
 		}
 	}
diff --git a/vlib/picohttpparser/request_test.v b/vlib/picohttpparser/request_test.v
index b9182bff3d8a1f..bc4935e700164d 100644
--- a/vlib/picohttpparser/request_test.v
+++ b/vlib/picohttpparser/request_test.v
@@ -54,7 +54,7 @@ pub fn test_handles_incomplete_requests() {
 	assert req.prev_len == 0
 
 	remaining_parsed := req.parse_request(' HTTP/1.1\r\n\r\n') or {
-		assert err.msg == 'error parsing request: invalid character "13"'
+		assert err.msg() == 'error parsing request: invalid character "13"'
 		0
 	}
 	assert remaining_parsed == 0