diff --git a/classes/WDTSLanguageOptions.php b/classes/WDTSLanguageOptions.inc
similarity index 100%
rename from classes/WDTSLanguageOptions.php
rename to classes/WDTSLanguageOptions.inc
diff --git a/classes/WDTSTranscript.php b/classes/WDTSTranscript.inc
similarity index 100%
rename from classes/WDTSTranscript.php
rename to classes/WDTSTranscript.inc
diff --git a/classes/WDTSTranscriptClasses.php b/classes/WDTSTranscriptClasses.inc
similarity index 88%
rename from classes/WDTSTranscriptClasses.php
rename to classes/WDTSTranscriptClasses.inc
index d3e22ac..33b7e6b 100644
--- a/classes/WDTSTranscriptClasses.php
+++ b/classes/WDTSTranscriptClasses.inc
@@ -1,6 +1,6 @@
 <?php
 
-require_once('WDTSTranscript.php');
+require_once('WDTSTranscript.inc');
 
 class WDTSQueuedTranscript extends WDTSTranscriptManager {
   var $key = "queued_transcripts";
diff --git a/classes/WDTSTranscriptOptions.php b/classes/WDTSTranscriptOptions.inc
similarity index 100%
rename from classes/WDTSTranscriptOptions.php
rename to classes/WDTSTranscriptOptions.inc
diff --git a/classes/WhatDidTheySayAdmin.php b/classes/WhatDidTheySayAdmin.inc
similarity index 100%
rename from classes/WhatDidTheySayAdmin.php
rename to classes/WhatDidTheySayAdmin.inc
diff --git a/test/WDTSLanguageOptionsTest.php b/test/WDTSLanguageOptionsTest.php
index a229841..24fbccd 100644
--- a/test/WDTSLanguageOptionsTest.php
+++ b/test/WDTSLanguageOptionsTest.php
@@ -1,7 +1,7 @@
 <?php
 
 require_once('PHPUnit/Framework.php');
-require_once(dirname(__FILE__) . '/../classes/WDTSLanguageOptions.php');
+require_once(dirname(__FILE__) . '/../classes/WDTSLanguageOptions.inc');
 require_once(dirname(__FILE__) . '/../../mockpress/mockpress.php');
 
 class WDTSLanguageOptionsTest extends PHPUnit_Framework_TestCase {
diff --git a/test/WDTSTranscriptOptionsTest.php b/test/WDTSTranscriptOptionsTest.php
index f327b7a..22f9302 100644
--- a/test/WDTSTranscriptOptionsTest.php
+++ b/test/WDTSTranscriptOptionsTest.php
@@ -2,7 +2,7 @@
 
 require_once('PHPUnit/Framework.php');
 require_once(dirname(__FILE__) . '/../../mockpress/mockpress.php');
-require_once(dirname(__FILE__) . '/../classes/WDTSTranscriptOptions.php');
+require_once(dirname(__FILE__) . '/../classes/WDTSTranscriptOptions.inc');
 
 class WDTSTranscriptOptionsTest extends PHPUnit_Framework_TestCase {
   function setUp() {
diff --git a/test/WDTSTranscriptTest.php b/test/WDTSTranscriptTest.php
index ce71e92..08a4010 100644
--- a/test/WDTSTranscriptTest.php
+++ b/test/WDTSTranscriptTest.php
@@ -2,7 +2,7 @@
 
 require_once('PHPUnit/Framework.php');
 require_once(dirname(__FILE__) . '/../../mockpress/mockpress.php');
-require_once(dirname(__FILE__) . '/../classes/WDTSTranscript.php');
+require_once(dirname(__FILE__) . '/../classes/WDTSTranscript.inc');
 
 class WDTSTranscriptTest extends PHPUnit_Framework_TestCase {
   function setUp() {
diff --git a/test/WhatDidTheySayAdminTest.php b/test/WhatDidTheySayAdminTest.php
index 13cc4e5..acf4490 100644
--- a/test/WhatDidTheySayAdminTest.php
+++ b/test/WhatDidTheySayAdminTest.php
@@ -2,7 +2,7 @@
 
 require_once('PHPUnit/Framework.php');
 require_once(dirname(__FILE__) . '/../../mockpress/mockpress.php');
-require_once(dirname(__FILE__) . '/../classes/WhatDidTheySayAdmin.php');
+require_once(dirname(__FILE__) . '/../classes/WhatDidTheySayAdmin.inc');
 
 class WhatDidTheySayAdminTest extends PHPUnit_Framework_TestCase {
   function setUp() {
diff --git a/what-did-they-say.php b/what-did-they-say.php
index 0fb7622..9d5c436 100644
--- a/what-did-they-say.php
+++ b/what-did-they-say.php
@@ -24,7 +24,7 @@ along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
-foreach (glob(dirname(__FILE__) . '/classes/*.php') as $file) { require_once($file); }
+foreach (glob(dirname(__FILE__) . '/classes/*.inc') as $file) { require_once($file); }
 
 $what_did_they_say_admin = new WhatDidTheySayAdmin(&$what_did_they_say);
 $what_did_they_say_admin->_parent_file = __FILE__;