diff --git a/net/uanytun/Makefile b/net/uanytun/Makefile
index d9b8c987d..0812078eb 100644
--- a/net/uanytun/Makefile
+++ b/net/uanytun/Makefile
@@ -137,7 +137,7 @@ define Build/Compile
     $(TARGET_CONFIGURE_OPTS) \
     $(VARIANT_MAKE_OPTS) \
     TARGET=Linux \
-    CFLAGS="$(TARGET_CFLAGS) $(VARIANT_CFLAGS)" \
+    CFLAGS="$(TARGET_CFLAGS) $(VARIANT_CFLAGS) $(TARGET_CPPFLAGS)" \
     LDFLAGS="$(TARGET_LDFLAGS) $(VARIANT_LDFLAGS)"
 	$(STRIP) $(PKG_BUILD_DIR)/src/uanytun
 endef