diff --git absl/container/internal/btree.h absl/container/internal/btree.h
--- absl/container/internal/btree.h
+++ absl/container/internal/btree.h
@@ -223,7 +223,7 @@ struct key_compare_adapter {
 
    public:
     using Base::Base;
-    checked_compare(Compare comp) : Base(std::move(comp)) {}  // NOLINT
+    checked_compare(Compare _comp) : Base(std::move(_comp)) {}  // NOLINT
 
     // Allow converting to Compare for use in key_comp()/value_comp().
     explicit operator Compare() const { return comp(); }