diff --git a/Makefile b/Makefile
index 20de80e..850ba8d 100644
--- a/Makefile
+++ b/Makefile
@@ -16,5 +16,5 @@ update:
 	-docker run --volume `pwd`/data:/app/data --volume `pwd`/app/static:/app/app/static microblogpub/microblogpub inv update
 
 .PHONY: prune-old-data
-update:
+prune-old-data:
 	-docker run --volume `pwd`/data:/app/data --volume `pwd`/app/static:/app/app/static microblogpub/microblogpub inv prune-old-data