diff --git a/tests/unit/curlcheck.h b/tests/unit/curlcheck.h
index 9525dd6fb511e2ff395ad000f7bffb8ae2fa8b67..66d9e71026f6bc2c3d432519b2115bd45b72638d 100644
--- a/tests/unit/curlcheck.h
+++ b/tests/unit/curlcheck.h
@@ -69,9 +69,9 @@
 extern int unitfail;
 
 #define UNITTEST_START                          \
-  int test(char *unused)                        \
+  int test(char *arg)                           \
   {                                             \
-  (void)unused;                                 \
+  (void)arg;                                    \
   if (unit_setup()) {                           \
     fail("unit_setup() failure");               \
   } else {