diff --git a/src/include/config.h b/src/include/config.h
index a44b72d49a0..7b09b766caa 100644
--- a/src/include/config.h
+++ b/src/include/config.h
@@ -42,7 +42,7 @@
 #  define NEED_UNION_SEMUN 
 #  define SB_PAD 40
 #  define HAS_TEST_AND_SET
-   include <sys/mman.h>  /* for msemaphore */
+#  include <sys/mman.h>  /* for msemaphore */
    typedef msemaphore slock_t;
 #endif