diff --git a/src/zm_crypt.cpp b/src/zm_crypt.cpp
index a550007a6..0682970c1 100644
--- a/src/zm_crypt.cpp
+++ b/src/zm_crypt.cpp
@@ -3,6 +3,7 @@
 #include "zm_logger.h"
 #include "BCrypt.hpp"
 #include <algorithm>
+#include <cstring>
 
 #if HAVE_LIBJWT
 #include <jwt.h>