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-rw-r--r--includes/rts/storage/TSO.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/includes/rts/storage/TSO.h b/includes/rts/storage/TSO.h
index d706282796..3a488d97b5 100644
--- a/includes/rts/storage/TSO.h
+++ b/includes/rts/storage/TSO.h
@@ -20,9 +20,9 @@ typedef struct {
*/
/*
- * Thread IDs are 32 bits.
+ * Thread IDs are 64 bits.
*/
-typedef StgWord32 StgThreadID;
+typedef StgWord64 StgThreadID;
#define tsoLocked(tso) ((tso)->flags & TSO_LOCKED)