diff --git a/files/docker-prune-dangling-images.sh b/files/docker-prune-dangling-images.sh
index 74cc4f6..d22e905 100644
--- a/files/docker-prune-dangling-images.sh
+++ b/files/docker-prune-dangling-images.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
 
-docker image prune --force > /var/log/docker-prune.log 2>&1
+# "system" prune, because pruning images only leaves a lot of garbage around
+docker system prune --force > /var/log/docker-prune.log 2>&1
 exit 0