diff --git a/src/or/main.c b/src/or/main.c
index 3eee60669b..198bcf9129 100644
--- a/src/or/main.c
+++ b/src/or/main.c
@@ -1966,9 +1966,11 @@ tor_main(int argc, char *argv[])
   tor_threads_init();
   init_logging();
 #ifdef USE_DMALLOC
-  int r = CRYPTO_set_mem_ex_functions(_tor_malloc, _tor_realloc,
-                                      _tor_dmalloc_free);
-  log_notice(LD_CONFIG, "Set up dmalloc; returned %d", r);
+  {
+    int r = CRYPTO_set_mem_ex_functions(_tor_malloc, _tor_realloc,
+                                        _tor_dmalloc_free);
+    log_notice(LD_CONFIG, "Set up dmalloc; returned %d", r);
+  }
 #endif
 #ifdef NT_SERVICE
   {