diff --git a/solenv/gbuild/platform/IOS_ARM_GCC.mk b/solenv/gbuild/platform/IOS_ARM_GCC.mk
index 27659c4e956a..a85a4b6188a4 100644
--- a/solenv/gbuild/platform/IOS_ARM_GCC.mk
+++ b/solenv/gbuild/platform/IOS_ARM_GCC.mk
@@ -26,7 +26,7 @@ ifeq ($(CXX),)
 $(error You must set CXX in the environment. See README.cross for example.)
 endif
 
-gb_COMPILERDEFAULTOPTFLAGS := -Oz
+gb_COMPILERDEFAULTOPTFLAGS := -Os
 
 include $(GBUILDDIR)/platform/com_GCC_defs.mk