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-rw-r--r--rts/sm/MarkWeak.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/rts/sm/MarkWeak.h b/rts/sm/MarkWeak.h
index 7b3a806857..2647a22eec 100644
--- a/rts/sm/MarkWeak.h
+++ b/rts/sm/MarkWeak.h
@@ -11,6 +11,9 @@
*
* ---------------------------------------------------------------------------*/
+#ifndef SM_MARKWEAK_H
+#define SM_MARKWEAK_H
+
extern StgWeak *old_weak_ptr_list;
extern StgTSO *resurrected_threads;
extern StgTSO *exception_threads;
@@ -19,3 +22,5 @@ void initWeakForGC ( void );
rtsBool traverseWeakPtrList ( void );
void markWeakPtrList ( void );
rtsBool traverseBlackholeQueue ( void );
+
+#endif /* SM_MARKWEAK_H */