diff --git a/src/Type/Definition/EnumType.php b/src/Type/Definition/EnumType.php
index a436144..b320bd5 100644
--- a/src/Type/Definition/EnumType.php
+++ b/src/Type/Definition/EnumType.php
@@ -72,12 +72,10 @@ class EnumType extends Type implements InputType, OutputType, LeafType
                 foreach ($config['values'] as $name => $value) {
                     if (is_string($name)) {
                         if (!is_array($value)) {
-                            throw new InvariantViolation(
-                                "{$this->name}.$name must refer to an associative array with a " .
-                                '"value" key representing an internal value but got: ' . Utils::printSafe($value)
-                            );
+                            $value = ['name' => $name, 'value' => $value];
+                        } else {
+                            $value += ['name' => $name, 'value' => $name];
                         }
-                        $value += ['name' => $name, 'value' => $name];
                     } else if (is_int($name) && is_string($value)) {
                         $value = ['name' => $value, 'value' => $value];
                     } else {
diff --git a/tests/Type/ValidationTest.php b/tests/Type/ValidationTest.php
index 3aa93e4..f1dcb25 100644
--- a/tests/Type/ValidationTest.php
+++ b/tests/Type/ValidationTest.php
@@ -1597,46 +1597,6 @@ class ValidationTest extends \PHPUnit_Framework_TestCase
         $type->assertValid();
     }
 
-    /**
-     * @it rejects an Enum type with missing value definition
-     */
-    public function testRejectsAnEnumTypeWithMissingValueDefinition()
-    {
-        $type = new EnumType([
-            'name' => 'SomeEnum',
-            'values' => [
-                'FOO' => null
-            ]
-        ]);
-
-        $this->setExpectedException(
-            InvariantViolation::class,
-            'SomeEnum.FOO must refer to an associative array with a "value" key representing an internal value but got: null'
-        );
-
-        $type->assertValid();
-    }
-
-    /**
-     * @it rejects an Enum type with incorrectly typed value definition
-     */
-    public function testRejectsAnEnumTypeWithIncorrectlyTypedValueDefinition()
-    {
-        $enumType = new EnumType([
-            'name' => 'SomeEnum',
-            'values' => [
-                'FOO' => 10
-            ]
-        ]);
-
-        $this->setExpectedException(
-            InvariantViolation::class,
-            'SomeEnum.FOO must refer to an associative array with a "value" key representing an internal value but got: 10'
-        );
-
-        $enumType->assertValid();
-    }
-
     /**
      * @it rejects an Enum type with incorrectly named values
      */