diff --git a/tests/system_resource_util_test.c b/tests/system_resource_util_test.c
index 119538073..f89c79a8f 100644
--- a/tests/system_resource_util_test.c
+++ b/tests/system_resource_util_test.c
@@ -8,6 +8,7 @@
 #include <aws/testing/aws_test_harness.h>
 
 static int s_test_resource_usage_maxrss(struct aws_allocator *allocator, void *ctx) {
+    (void)allocator;
     (void)ctx;
 
     struct aws_resource_usage ru;