diff --git a/src/Tls/TlsOpenSSL.c b/src/Tls/TlsOpenSSL.c
index 03c03ed..0dc882c 100644
--- a/src/Tls/TlsOpenSSL.c
+++ b/src/Tls/TlsOpenSSL.c
@@ -28,6 +28,8 @@
 #include <Memory.h>
 #include <Log.h>
 
+#include <string.h>
+
 #include <openssl/ssl.h>
 #include <openssl/err.h>