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-rw-r--r--rts/sm/GC.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/sm/GC.h b/rts/sm/GC.h
index a176fde3f6..c6b0c13a46 100644
--- a/rts/sm/GC.h
+++ b/rts/sm/GC.h
@@ -35,7 +35,7 @@ extern StgPtr mark_sp;
extern bool work_stealing;
-#ifdef DEBUG
+#if defined(DEBUG)
extern uint32_t mutlist_MUTVARS, mutlist_MUTARRS, mutlist_MVARS, mutlist_OTHERS,
mutlist_TVAR,
mutlist_TVAR_WATCH_QUEUE,