diff --git a/test/alloc.h b/test/alloc.h
index 5cd953e..187c6ad 100644
--- a/test/alloc.h
+++ b/test/alloc.h
@@ -48,7 +48,7 @@ static UNUSED void counting_free(void *ptr) {
     }
 }
 
-static UNUSED void check_allocator_status() {
+static UNUSED void check_allocator_status(void) {
     if (_alloc_count > 0) {
         fprintf(stderr, "Memory leak detected, allocation count is %jd!\n",
                 _alloc_count);