diff --git a/python/ruff-ecosystem/ruff_ecosystem/projects.py b/python/ruff-ecosystem/ruff_ecosystem/projects.py
index 4ed46565d8..c477588ef5 100644
--- a/python/ruff-ecosystem/ruff_ecosystem/projects.py
+++ b/python/ruff-ecosystem/ruff_ecosystem/projects.py
@@ -209,6 +209,9 @@ class CheckOptions(CommandOptions):
             # Ignore internal test rules
             "--ignore",
             "RUF9",
+            # Use the concise format for comparing violations
+            "--output-format",
+            "concise",
             f"--{'' if self.preview else 'no-'}preview",
         ]
         if self.select: