diff --git a/build_release.sh b/build_release.sh
index 809c2a5..e02212f 100755
--- a/build_release.sh
+++ b/build_release.sh
@@ -31,7 +31,7 @@ popd
 
 
 # Cleanup docker space
-docker image prune -a
+docker image prune -a -f
 
 
 # Build UltraCIC-III