diff --git a/lib/rubygems/commands/pristine_command.rb b/lib/rubygems/commands/pristine_command.rb
index b9941fabdf..d7c78ba13d 100644
--- a/lib/rubygems/commands/pristine_command.rb
+++ b/lib/rubygems/commands/pristine_command.rb
@@ -36,7 +36,6 @@ class Gem::Commands::PristineCommand < Gem::Command
 
     add_option("--only-missing-extensions",
                "Only restore gems with missing extensions") do |value, options|
-      options[:extensions_set] = true
       options[:only_missing_extensions] = value
     end