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-rw-r--r--rts/RtsProbes.d2
1 files changed, 1 insertions, 1 deletions
diff --git a/rts/RtsProbes.d b/rts/RtsProbes.d
index 226f881117..e5d8378845 100644
--- a/rts/RtsProbes.d
+++ b/rts/RtsProbes.d
@@ -6,7 +6,7 @@
*
* ---------------------------------------------------------------------------*/
-#ifdef __APPLE__ && __MACH__
+#if defined(__APPLE__) && __MACH__
# if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_9
# define USE_INTTYPES_H_FOR_RTS_PROBES_D
# endif