diff --git a/tools/grit/preprocess_if_expr.gni b/tools/grit/preprocess_if_expr.gni
index 850bff9aa94b453b1959e4c96cc63cafd6c58a77..9278d24be8f10da457baa819dd0cd24b572b4362 100644
--- a/tools/grit/preprocess_if_expr.gni
+++ b/tools/grit/preprocess_if_expr.gni
@@ -76,5 +76,6 @@ template("preprocess_if_expr") {
         invoker.enable_removal_comments) {
       args += [ "--enable_removal_comments" ]
     }
+    import("//brave/tools/chromium_src/lit_mangler/sources.gni") inputs += brave_lit_mangler_preprocess_if_expr_inputs
   }
 }