diff --git a/runtime.c b/runtime.c
index dad42bbf..150e38d2 100644
--- a/runtime.c
+++ b/runtime.c
@@ -2697,7 +2697,7 @@ void GC(void *data, closure cont, object *args, int num_args)
   // Cooperate with the collector thread
   gc_mut_cooperate((gc_thread_data *)data);
 
-#ifdef GC_DEBUG_TRACE
+#if GC_DEBUG_TRACE
   printf("done with minor GC\n");
 #endif
   // Let it all go, Neo...