diff --git a/test/datatype/reduce_local.c b/test/datatype/reduce_local.c
index baa14310c50..9f1c06d4ba0 100644
--- a/test/datatype/reduce_local.c
+++ b/test/datatype/reduce_local.c
@@ -20,6 +20,7 @@
 /* needed for posix_memalign() and getopt() */
 #define _POSIX_C_SOURCE 200809L
 
+#include "ompi_config.h"
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>