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-rw-r--r--rts/TraverseHeap.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/rts/TraverseHeap.h b/rts/TraverseHeap.h
index 8ea04dee32..0bc553e094 100644
--- a/rts/TraverseHeap.h
+++ b/rts/TraverseHeap.h
@@ -69,6 +69,8 @@ typedef union stackData_ {
retainer c_child_r;
} stackData;
+extern const stackData nullStackData;
+
typedef union stackAccum_ {
StgWord subtree_sizeW;
} stackAccum;