diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index 75a83b8..1a18da6 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -29,7 +29,7 @@ jobs:
         with:
           command: addpath('deps'), build
       - name: Add Mex.jl package to the default Julia environment
-        run: julia -e 'using Pkg; Pkg.add(".");'
+        run: julia -e 'using Pkg; Pkg.add(url=".");'
       - name: Run MATLAB tests
         uses: matlab-actions/run-tests@v1
         with: