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-rw-r--r--rts/sm/GCThread.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/sm/GCThread.h b/rts/sm/GCThread.h
index 15f1f13f20..bb206db64c 100644
--- a/rts/sm/GCThread.h
+++ b/rts/sm/GCThread.h
@@ -119,7 +119,7 @@ typedef struct gen_workspace_ {
typedef struct gc_thread_ {
Capability *cap;
-#ifdef THREADED_RTS
+#if defined(THREADED_RTS)
OSThreadId id; // The OS thread that this struct belongs to
SpinLock gc_spin;
SpinLock mut_spin;