diff --git a/src/m_json.c b/src/m_json.c
index 84bd78e7..893765af 100644
--- a/src/m_json.c
+++ b/src/m_json.c
@@ -14,6 +14,7 @@
 #include "m_json.h"
 
 #include <stdio.h>
+#include <string.h>
 #include "i_printf.h"
 
 #include "cjson/cJSON.h"