diff --git a/package/network/utils/iwcap/Makefile b/package/network/utils/iwcap/Makefile
index 7b43d6222a..cc63a2ebb3 100644
--- a/package/network/utils/iwcap/Makefile
+++ b/package/network/utils/iwcap/Makefile
@@ -33,7 +33,7 @@ define Build/Configure
 endef
 
 define Build/Compile
-	$(TARGET_CC) $(TARGET_CFLAGS) \
+	$(TARGET_CC) $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) \
 		-o $(PKG_BUILD_DIR)/iwcap $(PKG_BUILD_DIR)/iwcap.c
 endef