diff --git a/src/or/main.c b/src/or/main.c
index 4ff46461ff..1b50b4d7df 100644
--- a/src/or/main.c
+++ b/src/or/main.c
@@ -1978,8 +1978,7 @@ tor_main(int argc, char *argv[])
 #ifdef USE_DMALLOC
   int r = CRYPTO_set_mem_ex_functions(_tor_malloc, _tor_realloc,
                                       _tor_dmalloc_free);
-  if (!r) {
-    log_warn("Couldn't configure openssl to use dmalloc functions.");
+  tor_assert(r);
 #endif
 #ifdef NT_SERVICE
   {