diff --git a/wireguard-go-bridge/src/git.zx2c4.com/wireguard-go/api-ios.go b/wireguard-go-bridge/src/git.zx2c4.com/wireguard-go/api-ios.go
index 77f398e..dcc588f 100644
--- a/wireguard-go-bridge/src/git.zx2c4.com/wireguard-go/api-ios.go
+++ b/wireguard-go-bridge/src/git.zx2c4.com/wireguard-go/api-ios.go
@@ -5,6 +5,7 @@
 
 package main
 
+// #include <stdlib.h>
 // #include <sys/types.h>
 // static void callLogger(void *func, int level, const char *tag, const char *msg)
 // {