diff --git a/lib/gitlab/ci/config/entry/docker_image.rb b/lib/gitlab/ci/config/entry/docker_image.rb
deleted file mode 100644
index 1170e129bc0..00000000000
--- a/lib/gitlab/ci/config/entry/docker_image.rb
+++ /dev/null
@@ -1,31 +0,0 @@
-module Gitlab
-  module Ci
-    class Config
-      module Entry
-        module DockerImage
-          def hash?
-            @config.is_a?(Hash)
-          end
-
-          def string?
-            @config.is_a?(String)
-          end
-
-          def name
-            value[:name]
-          end
-
-          def entrypoint
-            value[:entrypoint]
-          end
-
-          def value
-            return { name: @config } if string?
-            return @config if hash?
-            {}
-          end
-        end
-      end
-    end
-  end
-end
diff --git a/lib/gitlab/ci/config/entry/image.rb b/lib/gitlab/ci/config/entry/image.rb
index 10f35a2dbc1..897dcff8012 100644
--- a/lib/gitlab/ci/config/entry/image.rb
+++ b/lib/gitlab/ci/config/entry/image.rb
@@ -7,7 +7,6 @@ module Gitlab
         #
         class Image < Node
           include Validatable
-          include DockerImage
 
           ALLOWED_KEYS = %i[name entrypoint].freeze
 
@@ -18,6 +17,28 @@ module Gitlab
             validates :name, type: String, presence: true
             validates :entrypoint, type: String, allow_nil: true
           end
+
+          def hash?
+            @config.is_a?(Hash)
+          end
+
+          def string?
+            @config.is_a?(String)
+          end
+
+          def name
+            value[:name]
+          end
+
+          def entrypoint
+            value[:entrypoint]
+          end
+
+          def value
+            return { name: @config } if string?
+            return @config if hash?
+            {}
+          end
         end
       end
     end
diff --git a/lib/gitlab/ci/config/entry/service.rb b/lib/gitlab/ci/config/entry/service.rb
index fd0aec23803..b52faf48b58 100644
--- a/lib/gitlab/ci/config/entry/service.rb
+++ b/lib/gitlab/ci/config/entry/service.rb
@@ -5,9 +5,8 @@ module Gitlab
         ##
         # Entry that represents a configuration of Docker service.
         #
-        class Service < Node
+        class Service < Image
           include Validatable
-          include DockerImage
 
           ALLOWED_KEYS = %i[name entrypoint command alias].freeze