diff --git a/lib/libesp32/berry_mapping/src/be_const_members.c b/lib/libesp32/berry_mapping/src/be_const_members.c
index 01a7b322c..55baa634f 100644
--- a/lib/libesp32/berry_mapping/src/be_const_members.c
+++ b/lib/libesp32/berry_mapping/src/be_const_members.c
@@ -22,6 +22,7 @@
 
 #include "be_mapping.h"
 #include "be_exec.h"
+#include "be_string.h"
 #include <string.h>
 /*********************************************************************************************\
  * Takes a pointer to be_const_member_t array and size