diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7d1cc2c..0aaddb3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -32,13 +32,13 @@ jobs:
       ## TODO: do this in a matrix
     - name: Compiler ${{matrix.compiler}}
       env:
-        NIXSHELL: "../../shell.nix"
+        WITH_SHELL: "nix-shell ../../shell.nix--argstr compiler ${{matrix.compiler}} --run"
       run: |
         mkdir -p build/${{matrix.compiler}}
         cd build/${{matrix.compiler}}
-        nix-shell $NIXSHELL --run '../../configure'
-        nix-shell $NIXSHELL --run 'make ctf'
-        nix-shell $NIXSHELL --run 'make'
+        $WITH_SHELL '../../configure'
+        $WITH_SHELL 'make ctf'
+        $WITH_SHELL 'make'
 
 
   documentation: