diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 041f3311..b85c8bac 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -59,6 +59,7 @@ repos:
     - id: trailing-whitespace
     - id: name-tests-test
     - id: file-contents-sorter
+      args: [--unique]
       files: |
         (?x)^(
           .*requirements(-\w+)?.(in|txt)|