--- a/src/VBox/Main/webservice/Makefile.kmk	2013-11-21 19:00:46.812761628 +0100
+++ b/src/VBox/Main/webservice/Makefile.kmk	2016-08-18 15:16:05.803599026 +0100
@@ -724,7 +724,7 @@ $(VBOXWEB_OUT_DIR)/gsoap_generate_all_ts \
 		$(RECOMPILE_ON_MAKEFILE_CURRENT) | $$(dir $$@)
 	$(call MSG_GENERATE,,lots of files,$(GSOAPH_RELEVANT))
 	$(RM) -f $@
-	$(REDIRECT) -C $(VBOXWEB_OUT_DIR) -- $(VBOX_SOAPCPP2) $(VBOXWEB_SOAPCPP2_SKIP_FILES) -L -2 -w -I$(VBOX_PATH_GSOAP_IMPORT) $(GSOAPH_RELEVANT)
+	$(REDIRECT) -C $(VBOXWEB_OUT_DIR) -- $(VBOX_SOAPCPP2) $(VBOXWEB_SOAPCPP2_SKIP_FILES) -z1 -L -2 -w -I$(VBOX_PATH_GSOAP_IMPORT) $(GSOAPH_RELEVANT)
 ifeq ($(KBUILD_TARGET),win) # MSC -Wall workaround.
 	$(CP) -f "$(VBOXWEB_SOAP_CLIENT_H)" "$(VBOXWEB_SOAP_CLIENT_H).tmp"
 	$(SED) -f $(VBOX_PATH_WEBSERVICE)/stdsoap2.sed --output "$(VBOXWEB_SOAP_CLIENT_H)" "$(VBOXWEB_SOAP_CLIENT_H).tmp"