diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index ff3ab99..63815df 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -141,9 +141,9 @@
     return 0;
 }
 
-static void close_output( FILE* stdout )
+static void close_output( FILE* out_stream )
 {
-    fclose( stdout );
+    fclose( out_stream );
 }
 #endif /* __unix__ || __APPLE__ __MACH__ */