diff --git a/tests/include/test/memory.h b/tests/include/test/memory.h
index 8080f98..43fbb63 100644
--- a/tests/include/test/memory.h
+++ b/tests/include/test/memory.h
@@ -82,8 +82,8 @@
     mbedtls_test_memory_unpoison(ptr, size)
 
 #else /* MBEDTLS_TEST_MEMORY_CAN_POISON */
-#define MBEDTLS_TEST_MEMORY_POISON(ptr, size) ((void) 0)
-#define MBEDTLS_TEST_MEMORY_UNPOISON(ptr, size) ((void) 0)
+#define MBEDTLS_TEST_MEMORY_POISON(ptr, size) ((void) (ptr), (void) (size))
+#define MBEDTLS_TEST_MEMORY_UNPOISON(ptr, size) ((void) (ptr), (void) (size))
 #endif /* MBEDTLS_TEST_MEMORY_CAN_POISON */
 
 #endif /* TEST_MEMORY_H */