diff --git a/tools/upx/Makefile b/tools/upx/Makefile
index 3e76232012..c162e557cb 100644
--- a/tools/upx/Makefile
+++ b/tools/upx/Makefile
@@ -21,7 +21,8 @@ include $(INCLUDE_DIR)/host-build.mk
 define Host/Compile
 	rm -f $(HOST_BUILD_DIR)/src/.depend
 	$(MAKE) UPX_LZMADIR="$(BUILD_DIR_HOST)/lzma-4.65" -C $(HOST_BUILD_DIR)/src \
-		CXXFLAGS_WERROR="" LDFLAGS="$(HOST_LDFLAGS) $(HOST_STATIC_LINKING)"
+		CXXFLAGS_WERROR="" LDFLAGS="$(HOST_LDFLAGS) $(HOST_STATIC_LINKING)" \
+		CXX="$(HOSTCXX)"
 endef
 
 define Host/Install