diff --git a/clang_tidy/clang_tidy.bzl b/clang_tidy/clang_tidy.bzl
index 60b4aed..db6fc95 100644
--- a/clang_tidy/clang_tidy.bzl
+++ b/clang_tidy/clang_tidy.bzl
@@ -70,7 +70,7 @@ def _run_tidy(
 
         args.add_all(compilation_context.system_includes.to_list(), before_each = "-isystem")
 
-    args.add_all(compilation_context.external_includes.to_list(), before_each = "-isystem")
+        args.add_all(compilation_context.external_includes.to_list(), before_each = "-isystem")
 
     ctx.actions.run(
         inputs = inputs,