diff --git a/src/JsonSchema/Constraints/Constraint.php b/src/JsonSchema/Constraints/Constraint.php
index 94956dfd..889e4ecb 100644
--- a/src/JsonSchema/Constraints/Constraint.php
+++ b/src/JsonSchema/Constraints/Constraint.php
@@ -82,7 +82,7 @@ public function addErrors(array $errors)
      */
     public function getErrors()
     {
-        return array_unique($this->errors, SORT_REGULAR);
+        return $this->errors;
     }
 
     /**
diff --git a/src/JsonSchema/Validator.php b/src/JsonSchema/Validator.php
index 02feaca6..70d4bfbf 100644
--- a/src/JsonSchema/Validator.php
+++ b/src/JsonSchema/Validator.php
@@ -40,6 +40,6 @@ public function check($value, $schema = null, $path = null, $i = null)
         $validator = new Schema($this->checkMode, $this->uriRetriever);
         $validator->check($value, $schema);
 
-        $this->addErrors($validator->getErrors());
+        $this->addErrors(array_unique($validator->getErrors(), SORT_REGULAR));
     }
 }
diff --git a/tests/JsonSchema/Tests/Constraints/OfPropertiesTest.php b/tests/JsonSchema/Tests/Constraints/OfPropertiesTest.php
index f8ecd05e..b06628d3 100644
--- a/tests/JsonSchema/Tests/Constraints/OfPropertiesTest.php
+++ b/tests/JsonSchema/Tests/Constraints/OfPropertiesTest.php
@@ -88,6 +88,121 @@ public function getInvalidTests()
                     ),
                 ),
             ),
+            array(
+                '{"prop1": [1,2]}',
+                '{
+                  "type": "object",
+                  "properties": {
+                    "prop1": {
+                      "oneOf": [
+                        {
+                          "type": "string",
+                          "pattern": "^[a-z]*$"
+                        },
+                        {
+                          "type": "string",
+                          "pattern": "^[A-Z]*$"
+                        }
+                      ]
+                    }
+                  }
+                }'
+            ),
+            array(
+                '{"prop1": [1,2]}',
+                '{
+                  "type": "object",
+                  "properties": {
+                    "prop1": {
+                      "anyOf": [
+                        {
+                          "type": "string",
+                          "pattern": "^[A-Z]*$"
+                        }
+                      ]
+                    }
+                  }
+                }'
+            ),
+            array(
+                '{"prop1": [1,2]}',
+                '{
+                  "type": "object",
+                  "properties": {
+                    "prop1": {
+                      "anyOf": [
+                        {
+                          "type": "number"
+                        },
+                        {
+                          "type": "string",
+                          "pattern": "^[A-Z]*$"
+                        }
+                      ]
+                    }
+                  }
+                }'
+            ),
+            array(
+                '{"prop1": [1,2]}',
+                '{
+                  "type": "object",
+                  "properties": {
+                    "prop1": {
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "string",
+                          "pattern": "^[A-Z]*$"
+                        }
+                      ]
+                    }
+                  }
+                }'
+            ),
+            array(
+                '{"prop1": [1,2]}',
+                '{
+                  "type": "object",
+                  "properties": {
+                    "prop1": {
+                      "anyOf": [
+                        {
+                          "type": "string",
+                          "pattern": "^[a-z]*$"
+                        },
+                        {
+                          "type": "string",
+                          "pattern": "^[A-Z]*$"
+                        }
+                      ]
+                    }
+                  }
+                }'
+            ),
+            array(
+                '{"prop1": [1,2]}',
+                '{
+                  "type": "object",
+                  "properties": {
+                    "prop1": {
+                      "anyOf": [
+                        {
+                          "type": "number"
+                        },
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "string"
+                        }
+                      ]
+                    }
+                  }
+                }'
+            )
         );
     }
 }