diff --git a/.clang-format b/.clang-format
index 3578d7f1cad..c921cd9a5e9 100644
--- a/.clang-format
+++ b/.clang-format
@@ -44,6 +44,7 @@ IncludeCategories:
 # Major 3rd-Party components of apps
   - Regex:           '^<Q[^/]+>$'
     Priority:        300
+    CaseSensitive:   true
   - Regex:           '^<ui_[^/]+\.h>$'
     Priority:        300
   - Regex:           '^<vtk[^/]+\.h>$'