diff --git a/ompi/mca/coll/sm/coll_sm_module.c b/ompi/mca/coll/sm/coll_sm_module.c
index b8eb83aefe..7c87a4015d 100644
--- a/ompi/mca/coll/sm/coll_sm_module.c
+++ b/ompi/mca/coll/sm/coll_sm_module.c
@@ -29,6 +29,9 @@
 #include "ompi_config.h"
 
 #include <stdio.h>
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
 #ifdef HAVE_SCHED_H
 #include <sched.h>
 #endif
diff --git a/ompi/mca/coll/sm/coll_sm_reduce.c b/ompi/mca/coll/sm/coll_sm_reduce.c
index f615be1896..52e5c65335 100644
--- a/ompi/mca/coll/sm/coll_sm_reduce.c
+++ b/ompi/mca/coll/sm/coll_sm_reduce.c
@@ -18,6 +18,10 @@
 
 #include "ompi_config.h"
 
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
 #include "ompi/constants.h"
 #include "ompi/communicator/communicator.h"
 #include "ompi/datatype/convertor.h"