diff --git a/isabelle_dof/hooks/build b/isabelle_dof/hooks/build
index 3be65b7..3894f31 100755
--- a/isabelle_dof/hooks/build
+++ b/isabelle_dof/hooks/build
@@ -43,5 +43,5 @@ else
 fi
 
 $CONTAINER build --build-arg isadof_version="$ISADOF_VERSION" \
-                 -t $IMAGE_NAME
+                 -t $IMAGE_NAME .