diff --git a/ee/app/models/push_rule.rb b/ee/app/models/push_rule.rb
index a2a73a9f76382f6e16d1422eac021e9bfb97a914..40c35885f3806f6fda94eb51938711bd7b5d05c5 100644
--- a/ee/app/models/push_rule.rb
+++ b/ee/app/models/push_rule.rb
@@ -122,7 +122,7 @@ def commit_committer_check=(value)
   def data_match?(data, regex, multiline: false)
     if regex.present?
       regexp = if allow_regex_fallback?
-                 Gitlab::UntrustedRegexp.with_fallback(regex, multiline: multiline)
+                 Gitlab::UntrustedRegexp::RubySyntax.fabricate!('/' + regex + '/')
                else
                  Gitlab::UntrustedRegexp.new(regex, multiline: multiline)
                end
diff --git a/ee/spec/models/push_rule_spec.rb b/ee/spec/models/push_rule_spec.rb
index 407e4b04fa7c4b470513ac38af28776938bb9411..ec3e89b785d9882dc6a55f38bd7c97f1febc4870 100644
--- a/ee/spec/models/push_rule_spec.rb
+++ b/ee/spec/models/push_rule_spec.rb
@@ -62,13 +62,6 @@
 
         subject.branch_name_allowed?('ee-feature-ee')
       end
-
-      it 'falls back to ruby regex engine' do
-        push_rule.update_column(:branch_name_regex, '(ee|ce).*\1')
-
-        expect(subject.branch_name_allowed?('ee-feature-ee')).to be true
-        expect(subject.branch_name_allowed?('ee-feature-ce')).to be false
-      end
     end
   end