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-rw-r--r--includes/Storage.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/includes/Storage.h b/includes/Storage.h
index e541082ee6..5d3e7733cf 100644
--- a/includes/Storage.h
+++ b/includes/Storage.h
@@ -239,7 +239,6 @@ extern void GarbageCollect(rtsBool force_major_gc, nat gc_type, Capability *cap)
*/
#if defined(THREADED_RTS)
extern Mutex sm_mutex;
-extern Mutex atomic_modify_mutvar_mutex;
#endif
#if defined(THREADED_RTS)