diff --git a/toxcore/crypto_core_test.cc b/toxcore/crypto_core_test.cc
index 1fbdd296..cdc315b2 100644
--- a/toxcore/crypto_core_test.cc
+++ b/toxcore/crypto_core_test.cc
@@ -29,7 +29,8 @@ enum {
 
 clock_t memcmp_time(void *a, void *b, size_t len) {
   clock_t start = clock();
-  crypto_memcmp(a, b, len);
+  volatile int result = crypto_memcmp(a, b, len);
+  (void)result;
   return clock() - start;
 }