diff --git a/src/threads/mutex_unix.h b/src/threads/mutex_unix.h
index 66fe8b83cb..d5a2ce76b6 100644
--- a/src/threads/mutex_unix.h
+++ b/src/threads/mutex_unix.h
@@ -26,7 +26,7 @@
 
 struct ompi_mutex_t {
     ompi_object_t super;
-#if defined(OMPI_HAVE_POSIX_THREADS)
+#if OMPI_HAVE_POSIX_THREADS
     pthread_mutex_t m_lock_pthread;
 #endif
     ompi_lock_t m_lock_atomic;