diff --git a/stubdom/Makefile b/stubdom/Makefile
index 90d9ffcd9f..c6de5f68ae 100644
--- a/stubdom/Makefile
+++ b/stubdom/Makefile
@@ -105,7 +105,7 @@ cross-newlib: $(NEWLIB_STAMPFILE)
 $(NEWLIB_STAMPFILE): mk-headers-$(XEN_TARGET_ARCH) newlib-$(NEWLIB_VERSION)
 	mkdir -p newlib-$(XEN_TARGET_ARCH)
 	( cd newlib-$(XEN_TARGET_ARCH) && \
-	  CC_FOR_TARGET="$(CC) $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(NEWLIB_CFLAGS)" AR_FOR_TARGET=$(AR) LD_FOR_TARGET=$(LD) RANLIB_FOR_TARGET=$(RANLIB) ../newlib-$(NEWLIB_VERSION)/configure --prefix=$(CROSS_PREFIX) --verbose --target=$(GNU_TARGET_ARCH)-xen-elf --enable-newlib-io-long-long --disable-multilib && \
+	  CC_FOR_TARGET="$(CC) $(TARGET_CPPFLAGS) $(TARGET_CFLAGS) $(NEWLIB_CFLAGS)" AR_FOR_TARGET=$(AR) LD_FOR_TARGET=$(LD) RANLIB_FOR_TARGET=$(RANLIB) ../newlib-$(NEWLIB_VERSION)/configure --prefix=$(CROSS_PREFIX) --verbose --target=$(GNU_TARGET_ARCH)-xen-elf --enable-newlib-io-long-long --enable-newlib-io-c99-formats --disable-multilib && \
 	  $(MAKE) DESTDIR= && \
 	  $(MAKE) DESTDIR= install )