diff --git a/Makefile.in b/Makefile.in
index ece48d46..59ee7152 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -476,8 +476,8 @@ stamps/build-newlib: $(srcdir)/riscv-newlib stamps/build-gcc-newlib-stage1
 		--enable-newlib-io-long-double \
 		--enable-newlib-io-long-long \
 		--enable-newlib-io-c99-formats \
-		CFLAGS_FOR_TARGET="-Os $(CFLAGS_FOR_TARGET)" \
-		CXXFLAGS_FOR_TARGET="-Os $(CXXFLAGS_FOR_TARGET)"
+		CFLAGS_FOR_TARGET="-O2 $(CFLAGS_FOR_TARGET)" \
+		CXXFLAGS_FOR_TARGET="-O2 $(CXXFLAGS_FOR_TARGET)"
 	$(MAKE) -C $(notdir $@)
 	$(MAKE) -C $(notdir $@) install
 	mkdir -p $(dir $@) && touch $@