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-rw-r--r--rts/Sanity.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/Sanity.h b/rts/Sanity.h
index 48f3383714..3020246a70 100644
--- a/rts/Sanity.h
+++ b/rts/Sanity.h
@@ -7,6 +7,7 @@
* ---------------------------------------------------------------------------*/
#ifndef SANITY_H
+#define SANITY_H
#ifdef DEBUG
@@ -39,4 +40,3 @@ extern rtsBool isBlackhole( StgTSO* tso, StgClosure* p );
#endif /* DEBUG */
#endif /* SANITY_H */
-