diff --git a/net/mdnsresponder/Makefile b/net/mdnsresponder/Makefile
index 4b2f5be68..627fd449f 100644
--- a/net/mdnsresponder/Makefile
+++ b/net/mdnsresponder/Makefile
@@ -86,7 +86,7 @@ endef
 # not found:
 MAKE_FLAGS += \
 	LD="$(TARGET_CC)"  \
-	CFLAGS_DEBUG="$(TARGET_CFLAGS)" \
+	CFLAGS_DEBUG="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS)" \
 	LINKOPTS=-lc \
 	LDCONFIG= \
 	ETCBASE="$(PKG_INSTALL_DIR)/etc" \