diff --git a/tools/check_format_compatible.sh b/tools/check_format_compatible.sh
index d3d07d00b..820fb42c5 100755
--- a/tools/check_format_compatible.sh
+++ b/tools/check_format_compatible.sh
@@ -85,7 +85,7 @@ done
 checkout_flag=${1:-"master"}
 
 echo == Building $checkout_flag debug
-https_proxy="fwdproxy:8080" git checkout github_origin/$checkout_flag -b $checkout_flag
+https_proxy="fwdproxy:8080" git checkout github_origin/$checkout_flag -b tmp-$checkout_flag
 make clean
 make ldb -j32
 compare_base_db_dir=$test_dir"/base_db_dir"