diff --git a/Makefile b/Makefile
index 1956e9d..2f339a8 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,7 @@ clean:
 # duplicate tags with Propellor.Property. removed from the start, as we
 # often import qualified by just the module base name.
 tags:
-	find . | grep -v /.git/ | grep -v /tmp/ | grep -v /dist/ | grep -v /doc/ | egrep '\.hs$$' | xargs hothasktags | perl -ne 'print; s/Propellor\.Property\.//; print' > tags  2>/dev/null
+	find . | grep -v /.git/ | grep -v /tmp/ | grep -v /dist/ | grep -v /doc/ | egrep '\.hs$$' | xargs hothasktags | perl -ne 'print; s/Propellor\.Property\.//; print' | sort > tags  2>/dev/null
 
 # Upload to hackage.
 hackage: