diff --git a/src/UsedSymbolExtractor.php b/src/UsedSymbolExtractor.php
index 371bc61..84f3b2d 100644
--- a/src/UsedSymbolExtractor.php
+++ b/src/UsedSymbolExtractor.php
@@ -415,6 +415,7 @@ private function canBeSymbolName(
             || $tokenBeforeName[0] === (PHP_VERSION_ID > 80000 ? T_NULLSAFE_OBJECT_OPERATOR : -1)
             || $tokenAfterName[0] === T_INSTEADOF
             || $tokenAfterName[0] === T_AS
+            || $tokenAfterName === ':'
         ) {
             return false;
         }
diff --git a/tests/UsedSymbolExtractorTest.php b/tests/UsedSymbolExtractorTest.php
index bc6e397..ebb2e46 100644
--- a/tests/UsedSymbolExtractorTest.php
+++ b/tests/UsedSymbolExtractorTest.php
@@ -206,6 +206,7 @@ public function provideVariants(): iterable
     private static function extensionSymbolsForExtensionsTestCases(): array
     {
         return [
+            strtolower('Normalizer') => SymbolKind::CLASSLIKE, // https://www.php.net/manual/en/class.normalizer.php
             strtolower('XMLReader') => SymbolKind::CLASSLIKE,
             strtolower('PDO') => SymbolKind::CLASSLIKE,
             strtolower('json_encode') => SymbolKind::FUNCTION,
diff --git a/tests/data/not-autoloaded/used-symbols/extensions.php b/tests/data/not-autoloaded/used-symbols/extensions.php
index c2c52dd..968c191 100644
--- a/tests/data/not-autoloaded/used-symbols/extensions.php
+++ b/tests/data/not-autoloaded/used-symbols/extensions.php
@@ -20,3 +20,6 @@
 CURLOPT_SSL_VERIFYPEER;
 \json_decode('');
 ZipArchive::class;
+
+function foo($normalizer) {}
+foo(normalizer: 1);