diff --git a/.github/workflows/apptainer.yml b/.github/workflows/apptainer.yml
index 516ea3729fd527192f812528a538b222171cc6a0..f5f7c89e2461d6d5b1d0749d31bd905e85a635af 100644
--- a/.github/workflows/apptainer.yml
+++ b/.github/workflows/apptainer.yml
@@ -21,7 +21,9 @@ jobs:
       uses: actions/checkout@v1
 
     - name: Build Container
-      run: singularity build cobrexa.sif cobrexa.def
+      run: |
+        alias apptainer=singularity
+        apptainer build cobrexa.sif cobrexa
 
     - name: debug find all executables
       run: |