diff --git a/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb b/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb
index 32d08630..9b25a6ed 100644
--- a/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb
+++ b/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb
@@ -11,6 +11,8 @@ def self.make_load_error(path)
 end
 
 module Kernel
+  private
+
   alias_method :require_without_bootsnap, :require
 
   # Note that require registers to $LOADED_FEATURES while load does not.