diff --git a/src/tools/openmpi/openmpi.c b/src/tools/openmpi/openmpi.c
index f397bddc1e..134a13c359 100644
--- a/src/tools/openmpi/openmpi.c
+++ b/src/tools/openmpi/openmpi.c
@@ -11,6 +11,7 @@ openmpi.c - main program for spawning persistent universe.
 
 #include <stdio.h>
 #include <string.h>
+#include <errno.h>
 
 #include "ompi_config.h"