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-rw-r--r--rts/Threads.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/Threads.c b/rts/Threads.c
index 9cfd36a7c9..f5eb9d360c 100644
--- a/rts/Threads.c
+++ b/rts/Threads.c
@@ -826,7 +826,7 @@ loop:
* Debugging: why is a thread blocked
* ------------------------------------------------------------------------- */
-#ifdef DEBUG
+#if DEBUG
void
printThreadBlockage(StgTSO *tso)
{