diff --git a/.github/workflows/c.yaml b/.github/workflows/c.yaml
index ebcb3a18..6d57ced6 100644
--- a/.github/workflows/c.yaml
+++ b/.github/workflows/c.yaml
@@ -32,8 +32,9 @@ jobs:
         
       - name: Install GSL
         if: runner.os == 'Windows'
+        env:
+          GSL_PATH: /tmp/gsl
         run: |
-          GSL_PATH=${{ runner.temp }}/gsl
           mkdir $GSL_PATH
           curl https://github.com/rwinlib/gsl/archive/v2.7.zip --output ${GSL_PATH}/gsl.zip
           cd $GSL_PATH && 7z x gsl.zip