diff --git a/src/Command/IndexPackagesCommand.php b/src/Command/IndexPackagesCommand.php
index 9f1900a5a..a16e96bce 100644
--- a/src/Command/IndexPackagesCommand.php
+++ b/src/Command/IndexPackagesCommand.php
@@ -234,6 +234,10 @@ private function packageToSearchableArray(Package $package, array $tags): array
             $record['replacementPackage'] = '';
         }
 
+        if (in_array($package->getType(), ['php-ext', 'php-ext-zend'], true)) {
+            $record['extension'] = 1;
+        }
+
         $record['tags'] = $tags;
 
         return $record;