diff --git a/test/BaseInputFilterTest.php b/test/BaseInputFilterTest.php
index f4618769..2ff4a16a 100644
--- a/test/BaseInputFilterTest.php
+++ b/test/BaseInputFilterTest.php
@@ -187,6 +187,10 @@ public function dataSets()
      */
     public function testCanValidateEntireDataset($dataset, $expected)
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $filter->setData($dataset);
         $this->assertSame($expected, $filter->isValid());
@@ -194,6 +198,10 @@ public function testCanValidateEntireDataset($dataset, $expected)
 
     public function testCanValidatePartialDataset()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $validData = array(
             'foo' => ' bazbat ',
@@ -217,6 +225,10 @@ public function testCanValidatePartialDataset()
 
     public function testCanRetrieveInvalidInputsOnFailedValidation()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $invalidData = array(
             'foo' => ' bazbat ',
@@ -242,6 +254,10 @@ public function testCanRetrieveInvalidInputsOnFailedValidation()
 
     public function testCanRetrieveValidInputsOnFailedValidation()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $invalidData = array(
             'foo' => ' bazbat ',
@@ -268,6 +284,10 @@ public function testCanRetrieveValidInputsOnFailedValidation()
 
     public function testValuesRetrievedAreFiltered()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $validData = array(
             'foo' => ' bazbat ',
@@ -296,6 +316,10 @@ public function testValuesRetrievedAreFiltered()
 
     public function testCanGetRawInputValues()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $validData = array(
             'foo' => ' bazbat ',
@@ -315,6 +339,10 @@ public function testCanGetRawInputValues()
 
     public function testCanGetValidationMessages()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $filter->get('baz')->setRequired(true);
         $filter->get('nest')->get('baz')->setRequired(true);
@@ -621,6 +649,10 @@ public function testValidationMarksInputValidWhenAllowEmptyFlagIsTrueAndContinue
 
     public function testCanRetrieveRawValuesIndividuallyWithoutValidating()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $data = array(
             'foo' => ' bazbat ',
@@ -637,6 +669,10 @@ public function testCanRetrieveRawValuesIndividuallyWithoutValidating()
 
     public function testCanRetrieveUnvalidatedButFilteredInputValue()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $data = array(
             'foo' => ' baz 2 bat ',
@@ -671,6 +707,10 @@ public function testGetRequiredNotEmptyValidationMessages()
     }
     public function testHasUnknown()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $validData = array(
             'foo' => ' bazbat ',
@@ -691,6 +731,10 @@ public function testHasUnknown()
     }
     public function testGetUknown()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $filter = $this->getInputFilter();
         $unknown = array(
             'bar' => '12345',
diff --git a/test/CollectionInputFilterTest.php b/test/CollectionInputFilterTest.php
index a407537e..03e29aa9 100644
--- a/test/CollectionInputFilterTest.php
+++ b/test/CollectionInputFilterTest.php
@@ -111,6 +111,10 @@ public function testSetInputFilter()
 
     public function testInputFilterInputsAppliedToCollection()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $this->filter->setInputFilter($this->getBaseInputFilter());
 
         $this->assertCount(4, $this->filter->getInputs());
@@ -158,6 +162,10 @@ public function testGetCountUsesSpecifiedCount()
 
     public function testCanValidateValidData()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $this->filter->setInputFilter($this->getBaseInputFilter());
         $this->filter->setData($this->getValidCollectionData());
         $this->assertTrue($this->filter->isValid());
@@ -165,6 +173,10 @@ public function testCanValidateValidData()
 
     public function testCanValidateValidDataWithNonConsecutiveKeys()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $collectionData = $this->getValidCollectionData();
         $collectionData[2] = $collectionData[0];
         unset($collectionData[0]);
@@ -175,6 +187,10 @@ public function testCanValidateValidDataWithNonConsecutiveKeys()
 
     public function testInvalidDataReturnsFalse()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $invalidCollectionData = array(
             array(
                 'foo' => ' bazbatlong ',
@@ -195,6 +211,10 @@ public function testInvalidDataReturnsFalse()
 
     public function testDataLessThanCountIsInvalid()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $invalidCollectionData = array(
             array(
                 'foo' => ' bazbat ',
@@ -216,6 +236,10 @@ public function testDataLessThanCountIsInvalid()
 
     public function testGetValues()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $expectedData = array(
             array(
                 'foo' => 'bazbat',
@@ -253,6 +277,10 @@ public function testGetValues()
 
     public function testGetRawValues()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $expectedData = array(
             array(
                 'foo' => ' bazbat ',
@@ -285,6 +313,10 @@ public function testGetRawValues()
 
     public function testGetMessagesForInvalidInputs()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $invalidCollectionData = array(
             array(
                 'foo' => ' bazbattoolong ',
@@ -327,6 +359,10 @@ public function testGetMessagesForInvalidInputs()
 
     public function testSetValidationGroupUsingFormStyle()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         // forms set an array of identical validation groups for each set of data
         $formValidationGroup = array(
             array(
@@ -367,6 +403,10 @@ public function testSetValidationGroupUsingFormStyle()
 
     public function testEmptyCollectionIsValidByDefault()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $data = array();
 
         $this->filter->setInputFilter($this->getBaseInputFilter());
@@ -377,6 +417,10 @@ public function testEmptyCollectionIsValidByDefault()
 
     public function testEmptyCollectionIsNotValidIfRequired()
     {
+        if (!extension_loaded('intl')) {
+            $this->markTestSkipped('ext/intl not enabled');
+        }
+
         $data = array();
 
         $this->filter->setInputFilter($this->getBaseInputFilter());