diff --git a/src/cmd/INIT/make.probe b/src/cmd/INIT/make.probe
index d6f4b1838..c1b931748 100644
--- a/src/cmd/INIT/make.probe
+++ b/src/cmd/INIT/make.probe
@@ -34,7 +34,7 @@ probe_lib_all_undef="-all -notall -all -none -Bwhole-archive -Bno-whole-archive
 probe_lib_multiple="-Wl,-zmuldefs"
 probe_libdir="shlib lib"
 probe_nmflags="'' -p -B"
-probe_optimize="-Os -O2 -O"
+probe_optimize="-Os -O"
 probe_pic="-Kpic -KPIC -fpic -fPIC -pic -PIC +z +Z"
 probe_no_protect="'-fno-stack-protector -fno-stack-protector-all' -GS-"
 probe_readonly="-R -Krodata -xMerge -Wa,-r"