diff --git a/src/auto4_lua_utils.h b/src/auto4_lua_utils.h
index 9639121c6..594eec419 100644
--- a/src/auto4_lua_utils.h
+++ b/src/auto4_lua_utils.h
@@ -40,11 +40,12 @@ inline void push_value(lua_State *L, wxString const& value) {
 }
 
 inline void push_value(lua_State *L, agi::fs::path const& value) {
-	lua_pushstring(L, value.string().c_str());
+	std::string strval = value.string();
+	lua_pushlstring(L, strval.c_str(), strval.size());
 }
 
 inline void push_value(lua_State *L, std::string const& value) {
-	lua_pushstring(L, value.c_str());
+	lua_pushlstring(L, value.c_str(), value.size());
 }
 
 inline void push_value(lua_State *L, lua_CFunction value) {