diff --git a/openmp/device/include/EmissaryMPI.h b/openmp/device/include/EmissaryMPI.h
index 816f41d9ae36e..d0035b5f9b4b8 100644
--- a/openmp/device/include/EmissaryMPI.h
+++ b/openmp/device/include/EmissaryMPI.h
@@ -10,6 +10,7 @@
 //
 //===----------------------------------------------------------------------===//
 #include "EmissaryIds.h"
+#include <mpi.h>
 #include <stdarg.h>
 
 typedef enum {