diff --git a/lib/bundler/definition.rb b/lib/bundler/definition.rb
index 7ccbc2248d1da8..6ad31f8e8ea967 100644
--- a/lib/bundler/definition.rb
+++ b/lib/bundler/definition.rb
@@ -385,7 +385,7 @@ def ensure_equivalent_gemfile_and_lockfile(explicit_flag = false)
       @dependencies.each {|d| both_sources[d.name][0] = d }
 
       locked_dependencies.each do |d|
-        next if !Bundler.feature_flag.bundler_3_mode? && @locked_specs[d.name].empty?
+        next if @locked_specs[d.name].empty?
 
         both_sources[d.name][1] = d
       end
diff --git a/spec/bundler/install/deploy_spec.rb b/spec/bundler/install/deploy_spec.rb
index 8553fcf356c428..879d5e54ae9247 100644
--- a/spec/bundler/install/deploy_spec.rb
+++ b/spec/bundler/install/deploy_spec.rb
@@ -297,7 +297,7 @@
       expect(out).to eq("WIN")
     end
 
-    it "works if a gem is missing, but it's on a different platform", :bundler => "< 3" do
+    it "works if a gem is missing, but it's on a different platform" do
       build_repo2
 
       install_gemfile <<-G