diff --git a/c_src/wterl.c b/c_src/wterl.c
index 17242e7..9f3fa85 100644
--- a/c_src/wterl.c
+++ b/c_src/wterl.c
@@ -23,6 +23,7 @@
 #include "erl_driver.h"
 
 #include <stdio.h>
+#include <string.h>
 
 #include "wiredtiger.h"