diff --git a/src/AspectMock/Intercept/FunctionInjector.php b/src/AspectMock/Intercept/FunctionInjector.php
index 8d07eaf..e1722b8 100644
--- a/src/AspectMock/Intercept/FunctionInjector.php
+++ b/src/AspectMock/Intercept/FunctionInjector.php
@@ -50,7 +50,7 @@ public function getParameterDeclaration(\ReflectionParameter $parameter, $intern
     {
         $text = (string)$parameter;
         if (preg_match('@Parameter\s#[0-9]+\s\[\s<(required|optional)>(.*)(\sor NULL)(.*)\s\]@', $text, $match)) {
-            $text = $match(2).$match[4];
+            $text = $match[2].$match[4];
         } elseif (preg_match('@Parameter\s#[0-9]+\s\[\s<(required|optional)>\s(.*)\s\]@', $text, $match)) {
             $text = $match[2];
         } else {
@@ -123,4 +123,4 @@ protected function place($var, $value)
     {
         $this->template = str_replace("{{{$var}}}", $value, $this->template);
     }
-} 
\ No newline at end of file
+}