1 files changed, 12 insertions, 0 deletions
diff --git a/lib/gitlab/ci/config/entry/needs.rb b/lib/gitlab/ci/config/entry/needs.rb
index 11b202ddde9..f0bfad80e6f 100644
--- a/lib/gitlab/ci/config/entry/needs.rb
+++ b/lib/gitlab/ci/config/entry/needs.rb
@@ -21,6 +21,10 @@ module Gitlab
               if config.is_a?(Hash) && config.empty?
                 errors.add(:config, 'can not be an empty Hash')
               end
+
+              if number_parallel_build?
+                errors.add(:config, 'cannot use "parallel: <number>".')
+              end
             end
 
             validate on: :composed do
@@ -47,6 +51,14 @@ module Gitlab
             end
           end
 
+          def number_parallel_build?
+            if config.is_a?(Array)
+              config.any? { |need_values| need_values.is_a?(Hash) && need_values[:parallel].is_a?(Numeric) }
+            elsif config.is_a?(Hash)
+              config[:parallel].is_a?(Numeric)
+            end
+          end
+
           def composable_class
             Entry::Need
           end