diff --git a/lib/utils.zsh b/lib/utils.zsh
index c625010..8b02d53 100644
--- a/lib/utils.zsh
+++ b/lib/utils.zsh
@@ -8,5 +8,5 @@ pid_for() {
 }
 
 intersect_files() {
-    comm -23 <(cat $1) <(cat $2)
+    comm -23 <(sort $1) <(sort $2)
 }