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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 c6b0c13a46..78f054931a 100644
--- a/rts/sm/GC.h
+++ b/rts/sm/GC.h
@@ -46,7 +46,7 @@ extern uint32_t mutlist_MUTVARS, mutlist_MUTARRS, mutlist_MVARS, mutlist_OTHERS,
#endif
#if defined(PROF_SPIN) && defined(THREADED_RTS)
-extern StgWord64 whitehole_spin;
+extern volatile StgWord64 whitehole_gc_spin;
#endif
void gcWorkerThread (Capability *cap);