diff --git a/lib/bundler/definition.rb b/lib/bundler/definition.rb
index d7246dadf0ec90..1970782d55b96e 100644
--- a/lib/bundler/definition.rb
+++ b/lib/bundler/definition.rb
@@ -394,8 +394,8 @@ def ensure_equivalent_gemfile_and_lockfile(explicit_flag = false)
         lock_source = lock_dep.source || sources.default_source
         next if lock_source.include?(gemfile_source)
 
-        gemfile_source_name = dep.source ? gemfile_source.identifier : "no specified source"
-        lockfile_source_name = lock_dep.source ? lock_source.identifier : "no specified source"
+        gemfile_source_name = dep.source ? gemfile_source.to_gemfile : "no specified source"
+        lockfile_source_name = lock_dep.source ? lock_source.to_gemfile : "no specified source"
         changed << "* #{name} from `#{lockfile_source_name}` to `#{gemfile_source_name}`"
       end
 
diff --git a/lib/bundler/source/git.rb b/lib/bundler/source/git.rb
index 42897813b47742..f7ad6057b46b79 100644
--- a/lib/bundler/source/git.rb
+++ b/lib/bundler/source/git.rb
@@ -46,6 +46,14 @@ def to_lock
         out << "  specs:\n"
       end
 
+      def to_gemfile
+        specifiers = %w[ref branch tag submodules glob].map do |opt|
+          "#{opt}: #{options[opt]}" if options[opt]
+        end
+
+        uri_with_specifiers(specifiers)
+      end
+
       def hash
         [self.class, uri, ref, branch, name, version, glob, submodules].hash
       end
@@ -80,7 +88,12 @@ def to_s
           ""
         end
 
-        specifiers = [rev, glob_for_display].compact
+        uri_with_specifiers([rev, glob_for_display])
+      end
+
+      def uri_with_specifiers(specifiers)
+        specifiers.compact!
+
         suffix =
           if specifiers.any?
             " (#{specifiers.join(", ")})"
diff --git a/lib/bundler/source/rubygems.rb b/lib/bundler/source/rubygems.rb
index af55ba0f2c8caf..af57acbbc2739a 100644
--- a/lib/bundler/source/rubygems.rb
+++ b/lib/bundler/source/rubygems.rb
@@ -123,6 +123,7 @@ def identifier
         end
       end
       alias_method :name, :identifier
+      alias_method :to_gemfile, :identifier
 
       def specs
         @specs ||= begin