diff --git a/test/default/cmptest.h b/test/default/cmptest.h
index 71fab353..bcf1064b 100644
--- a/test/default/cmptest.h
+++ b/test/default/cmptest.h
@@ -160,7 +160,7 @@ int main(void)
 
 #elif !defined(BROWSER_TESTS)
 
-FILE *fp_res;
+static FILE *fp_res;
 
 int main(void)
 {