diff --git a/.clang-format b/.clang-format
index e186fa1abbaba4b05162d81bad4dd18a41f0309b..c42cc851880e9f29980183ebc17a791e90a63645 100644
--- a/.clang-format
+++ b/.clang-format
@@ -89,6 +89,8 @@ IncludeCategories:
     Priority: 30
   - Regex: "^(<range/)"
     Priority: 40
+  - Regex: "^(<ceres/)"
+    Priority: 45
   - Regex: "^(<boost/)"
     Priority: 50
   - Regex: "^(<Eigen/)"