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-rw-r--r--include/mqueue.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mqueue.h b/include/mqueue.h
index 1ac4f13445..aba788e803 100644
--- a/include/mqueue.h
+++ b/include/mqueue.h
@@ -1,6 +1,6 @@
 #include <rt/mqueue.h>
 
-#ifdef IS_IN_librt
+#if IS_IN (librt)
 hidden_proto (mq_timedsend)
 hidden_proto (mq_timedreceive)
 hidden_proto (mq_setattr)