diff --git a/src/vs/languages/php/common/php.contribution.ts b/src/vs/languages/php/common/php.contribution.ts
index a783dc317eaa92f2f5eea71e5c7bbe99f75e7d00..1e4db393b66b4556918027e582d4ad5ac3a4e2be 100644
--- a/src/vs/languages/php/common/php.contribution.ts
+++ b/src/vs/languages/php/common/php.contribution.ts
@@ -8,9 +8,9 @@ import {ModesRegistry} from 'vs/editor/common/modes/modesRegistry';
 
 ModesRegistry.registerCompatMode({
 	id: 'php',
-	extensions: ['.php', '.phtml', '.ctp'],
+	extensions: ['.php', '.php4', '.php5', '.phtml', '.ctp'],
 	aliases: ['PHP', 'php'],
 	mimetypes: ['application/x-php'],
 	moduleId: 'vs/languages/php/common/php',
 	ctorName: 'PHPMode'
-});
\ No newline at end of file
+});