diff --git a/wpad_dhcp_mac.c b/wpad_dhcp_mac.c
index 21471ef..8e20522 100644
--- a/wpad_dhcp_mac.c
+++ b/wpad_dhcp_mac.c
@@ -8,6 +8,7 @@
 #include <TargetConditionals.h>
 
 #include "net_adapter.h"
+#include "util.h"
 
 char *wpad_dhcp_adapter_mac(uint8_t bind_ip[4], net_adapter_s *adapter, int32_t timeout_sec) {
 #if !TARGET_OS_IPHONE