diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 2d85c38e51..aee63bc314 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -43,15 +43,13 @@ jobs:
           choco install --no-progress MozillaBuild
           echo "C:/mozilla-build/bin" >> $GITHUB_PATH
           echo "C:/mozilla-build/msys2/usr/bin" >> $GITHUB_PATH
+          echo "OS_TARGET=WIN95" >> $GITHUB_ENV
 
       - name: Fetch NSS and NSPR
         shell: bash
         run: |
           hg clone https://hg.mozilla.org/projects/nspr "$NSPR_DIR"
           git clone --depth=1 https://github.com/nss-dev/nss "$NSS_DIR"
-          if [ "${{runner.os}}" == "Windows" ]; then
-            export OS_TARGET=WIN95
-          fi
           "$NSS_DIR"/build.sh -v
         env:
           NSS_DIR: ${{ github.workspace }}/nss