diff --git a/crypto/saf/saf_ec.c b/crypto/saf/saf_ec.c
index fe8b4f5e..4ba99360 100644
--- a/crypto/saf/saf_ec.c
+++ b/crypto/saf/saf_ec.c
@@ -47,6 +47,7 @@
  * ====================================================================
  */
 
+#include <string.h>
 #include <openssl/gmapi.h>
 #include <openssl/gmsdf.h>
 #include <openssl/gmsaf.h>
diff --git a/crypto/saf/saf_keyhandle.c b/crypto/saf/saf_keyhandle.c
index fd0df0f1..78dc8e6e 100644
--- a/crypto/saf/saf_keyhandle.c
+++ b/crypto/saf/saf_keyhandle.c
@@ -47,6 +47,7 @@
  * ====================================================================
  */
 
+#include <string.h>
 #include <limits.h>
 #include <openssl/evp.h>
 #include <openssl/gmsaf.h>
diff --git a/crypto/saf/saf_lib.c b/crypto/saf/saf_lib.c
index 9bb05618..a879d031 100644
--- a/crypto/saf/saf_lib.c
+++ b/crypto/saf/saf_lib.c
@@ -47,6 +47,7 @@
  * ====================================================================
  */
 
+#include <string.h>
 #include <openssl/gmsaf.h>
 #include "saf_lcl.h"