diff --git a/.github/workflows/apptainer.yml b/.github/workflows/apptainer.yml
index f5f7c89e2461d6d5b1d0749d31bd905e85a635af..9f58a9effcb57ca0eb05c88948a6c0e33dc3bdf0 100644
--- a/.github/workflows/apptainer.yml
+++ b/.github/workflows/apptainer.yml
@@ -22,8 +22,9 @@ jobs:
 
     - name: Build Container
       run: |
+        ls
         alias apptainer=singularity
-        apptainer build cobrexa.sif cobrexa
+        apptainer build cobrexa.sif ./cobrexa.def
 
     - name: debug find all executables
       run: |