diff --git a/tests/cpath/test_cpath.c b/tests/cpath/test_cpath.c
index 4fd2928..e112c33 100644
--- a/tests/cpath/test_cpath.c
+++ b/tests/cpath/test_cpath.c
@@ -65,7 +65,7 @@ TestFuncResult test_cpath_join_path(void) {
   }
 
   memset(out, 0, strlen(out));
-  snprintf(expected, 1, "");
+  snprintf(expected, 1, "%s", "");
   wapp_cpath_join_path(out, "", "");
 
   result = result && strcmp(out, expected) == 0;