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-rw-r--r--rts/Printer.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/Printer.c b/rts/Printer.c
index 8290d220a0..36fdf7bda4 100644
--- a/rts/Printer.c
+++ b/rts/Printer.c
@@ -381,7 +381,7 @@ printClosure( StgClosure *obj )
case TSO:
debugBelch("TSO(");
- debugBelch("%d (%p)",((StgTSO*)obj)->id, (StgTSO*)obj);
+ debugBelch("%lu (%p)",(unsigned long)(((StgTSO*)obj)->id), (StgTSO*)obj);
debugBelch(")\n");
break;