diff --git a/src/main/scala/app/LabelsController.scala b/src/main/scala/app/LabelsController.scala
index 2f9b2b7..2767af9 100644
--- a/src/main/scala/app/LabelsController.scala
+++ b/src/main/scala/app/LabelsController.scala
@@ -14,13 +14,13 @@
   case class LabelForm(labelName: String, color: String)
 
   val newForm = mapping(
-    "newLabelName" -> trim(label("Label name", text(required, maxlength(100)))),
-    "newColor"     -> trim(label("Color",      text(required, maxlength(7))))
+    "newLabelName" -> trim(label("Label name", text(required, identifier, maxlength(100)))),
+    "newColor"     -> trim(label("Color",      text(required, color)))
   )(LabelForm.apply)
 
   val editForm = mapping(
-    "editLabelName" -> trim(label("Label name", text(required, maxlength(100)))),
-    "editColor"     -> trim(label("Color",      text(required, maxlength(7))))
+    "editLabelName" -> trim(label("Label name", text(required, identifier, maxlength(100)))),
+    "editColor"     -> trim(label("Color",      text(required, color)))
   )(LabelForm.apply)
 
   post("/:owner/:repository/issues/label/new", newForm)(writableRepository { form =>
diff --git a/src/main/scala/util/Validations.scala b/src/main/scala/util/Validations.scala
index 5312e90..a518978 100644
--- a/src/main/scala/util/Validations.scala
+++ b/src/main/scala/util/Validations.scala
@@ -19,6 +19,8 @@
       }
   }
 
+  def color = pattern("#[0-9a-fA-F]{6}")
+
   /**
    * ValueType for the java.util.Date property.
    */