diff --git a/src/keyring/keyring_kmip.c b/src/keyring/keyring_kmip.c
index e1d570b6..a144f559 100644
--- a/src/keyring/keyring_kmip.c
+++ b/src/keyring/keyring_kmip.c
@@ -11,6 +11,7 @@
 
 #include <openssl/err.h>
 #include <openssl/ssl.h>
+#include <string.h>
 #include <kmip.h>
 #include <kmip_bio.h>
 #include <kmip_locate.h>