diff --git a/lib/bundler.rb b/lib/bundler.rb
index 0b6f70d9df1..468d3b0a062 100644
--- a/lib/bundler.rb
+++ b/lib/bundler.rb
@@ -369,7 +369,7 @@ def requires_sudo?
         unwritable_files = files.reject {|f| File.writable?(f) }
         sudo_needed = !unwritable_files.empty?
         if sudo_needed
-          Bundler.ui.warn "Following files may not be writable, so sudo is needed: #{unwritable_files.map(&:to_s).join(",")}"
+          Bundler.ui.warn "Following files may not be writable, so sudo is needed:\n  #{unwritable_files.map(&:to_s).join("\n  ")}"
         end
       end
 
diff --git a/spec/bundler/bundler_spec.rb b/spec/bundler/bundler_spec.rb
index 3e23f60f82b..0cc3bcd0324 100644
--- a/spec/bundler/bundler_spec.rb
+++ b/spec/bundler/bundler_spec.rb
@@ -320,12 +320,18 @@ def clear_cached_requires_sudo
     end
     context "unwritable paths" do
       before do
-        FileUtils.touch("tmp/vendor/bundle/unwritable.txt")
-        FileUtils.chmod(0o400, "tmp/vendor/bundle/unwritable.txt")
+        FileUtils.touch("tmp/vendor/bundle/unwritable1.txt")
+        FileUtils.touch("tmp/vendor/bundle/unwritable2.txt")
+        FileUtils.chmod(0o400, "tmp/vendor/bundle/unwritable1.txt")
+        FileUtils.chmod(0o400, "tmp/vendor/bundle/unwritable2.txt")
       end
       it "should return true and display warn message" do
         allow(Bundler).to receive(:bundle_path).and_return(Pathname("tmp/vendor/bundle"))
-        message = "Following files may not be writable, so sudo is needed: tmp/vendor/bundle/unwritable.txt"
+        message = <<-MESSAGE.chomp
+Following files may not be writable, so sudo is needed:
+  tmp/vendor/bundle/unwritable1.txt
+  tmp/vendor/bundle/unwritable2.txt
+MESSAGE
         expect(Bundler.ui).to receive(:warn).with(message)
         expect(Bundler.requires_sudo?).to eq(true)
       end