diff --git a/memcheck/tests/darwin/aligned_alloc.c b/memcheck/tests/darwin/aligned_alloc.c
index f8d580538..1c2fdb78c 100644
--- a/memcheck/tests/darwin/aligned_alloc.c
+++ b/memcheck/tests/darwin/aligned_alloc.c
@@ -4,7 +4,6 @@
 int main(void)
 {
    char* p = NULL;
-   int res;
 
    // zero size
    p = aligned_alloc(0, 8);