diff --git a/src/shared/firewall-util-private.h b/src/shared/firewall-util-private.h
index 97f8fe124e..38c8dfced5 100644
--- a/src/shared/firewall-util-private.h
+++ b/src/shared/firewall-util-private.h
@@ -6,6 +6,7 @@
 
 #include "sd-netlink.h"
 
+#include "firewall-util.h"
 #include "in-addr-util.h"
 
 typedef enum FirewallBackend {