diff --git a/prepare-build.sh b/prepare-build.sh
index 02c71b9..0953bad 100644
--- a/prepare-build.sh
+++ b/prepare-build.sh
@@ -28,7 +28,7 @@ git apply ../bromite-buildtools/depot_tools.diff
 cd ..
 
 echo -e ${RED} -------- set envs ${NC}
-PATH=$PWD/chromium/src/third_party/llvm-build/Release+Asserts/bin:$PWD/depot_tools/:/usr/local/go/bin:$PATH
+PATH=$GITHUB_WORKSPACE/chromium/src/third_party/llvm-build/Release+Asserts/bin:$GITHUB_WORKSPACE/depot_tools/:/usr/local/go/bin:$PATH
 
 echo -e ${RED} -------- download chromium pre-prepared ${NC}
 rm chromium.$VERSION.tar.gz
diff --git a/setup-goma-client.sh b/setup-goma-client.sh
index c506b3d..31f1c9f 100644
--- a/setup-goma-client.sh
+++ b/setup-goma-client.sh
@@ -1,21 +1,21 @@
 #!/bin/bash
 
 echo -e ${RED} -------- set envs ${NC}
-PATH=$PWD/chromium/src/third_party/llvm-build/Release+Asserts/bin:$PWD/depot_tools/:/usr/local/go/bin:$PATH
+PATH=$GITHUB_WORKSPACE/chromium/src/third_party/llvm-build/Release+Asserts/bin:$GITHUB_WORKSPACE/depot_tools/:/usr/local/go/bin:$PATH
 
-cipd install infra/goma/client/linux-amd64 -root $PWD/goma
+cipd install infra/goma/client/linux-amd64 -root $GITHUB_WORKSPACE/goma
 
-cat "nomatter" >$PWD/.debug_auth_file
-sudo cp $PWD/bromite-buildtools/goma_auth.py $PWD/goma/
+cat "nomatter" >$GITHUB_WORKSPACE/.debug_auth_file
+sudo cp $GITHUB_WORKSPACE/bromite-buildtools/goma_auth.py $GITHUB_WORKSPACE/goma/
 
 export GOMA_SERVER_HOST=127.0.0.1
 export GOMA_SERVER_PORT=5050
 export GOMA_USE_SSL=false
-export GOMA_HTTP_AUTHORIZATION_FILE=$PWD/.debug_auth_file
+export GOMA_HTTP_AUTHORIZATION_FILE=$GITHUB_WORKSPACE/.debug_auth_file
 export GOMA_HERMETIC=error
 export GOMA_USE_LOCAL=false
 export GOMA_FALLBACK=true
 export GOMA_ARBITRARY_TOOLCHAIN_SUPPORT=true
 
-$PWD/goma/goma_ctl.py ensure_stop
-$PWD/goma/goma_ctl.py ensure_start
+$GITHUB_WORKSPACE/goma/goma_ctl.py ensure_stop
+$GITHUB_WORKSPACE/goma/goma_ctl.py ensure_start
diff --git a/start-build.sh b/start-build.sh
index 7a12680..6089653 100644
--- a/start-build.sh
+++ b/start-build.sh
@@ -10,12 +10,12 @@ NC='\033[0m' # No Color
 #sudo apt-get install -y libxkbcommon-x11-0 libxkbcommon-dev
 
 echo -e ${RED} -------- set envs ${NC}
-PATH=$PWD/chromium/src/third_party/llvm-build/Release+Asserts/bin:$PWD/depot_tools/:/usr/local/go/bin:$PATH
+PATH=$GITHUB_WORKSPACE/chromium/src/third_party/llvm-build/Release+Asserts/bin:$GITHUB_WORKSPACE/depot_tools/:/usr/local/go/bin:$PATH
 
 cd chromium/src
 
 echo -e ${RED} -------- gn gen ${NC}
-gn gen --args="$(cat ../../bromite/build/GN_ARGS) target_cpu=\"x86\" use_goma=true goma_dir=\"../../goma\" " out/x86
+gn gen --args="$(cat ../../bromite/build/GN_ARGS) target_cpu=\"x86\" use_goma=true goma_dir=\"$GITHUB_WORKSPACE/goma\" " out/x86
 
 echo -e ${RED} -------- checking prebuild ${NC}
 rm out.$GITHUB_SHA.tar.gz