diff --git a/config/pkg/ext/ext-mongodb.yml b/config/pkg/ext/ext-mongodb.yml
index 7cbdbb14..97f9f0a0 100644
--- a/config/pkg/ext/ext-mongodb.yml
+++ b/config/pkg/ext/ext-mongodb.yml
@@ -9,7 +9,9 @@ ext-mongodb:
     metadata:
       license-files: [LICENSE]
       license: PHP-3.01
-  suggests:
+  depends@windows:
+    - ext-openssl
+  suggests@unix:
     - icu
     - openssl
     - zstd
@@ -18,4 +20,5 @@ ext-mongodb:
     - CoreFoundation
     - Security
   php-extension:
-    arg-type: custom
+    arg-type@unix: custom
+    arg-type@windows: '--enable-mongodb --with-mongodb-client-side-encryption'
diff --git a/src/Package/Extension/mongodb.php b/src/Package/Extension/mongodb.php
index 3434491d..944ce86a 100644
--- a/src/Package/Extension/mongodb.php
+++ b/src/Package/Extension/mongodb.php
@@ -4,14 +4,27 @@ declare(strict_types=1);
 
 namespace Package\Extension;
 
+use Package\Target\php;
+use StaticPHP\Attribute\Package\BeforeStage;
 use StaticPHP\Attribute\Package\CustomPhpConfigureArg;
 use StaticPHP\Attribute\Package\Extension;
 use StaticPHP\Package\PackageInstaller;
 use StaticPHP\Package\PhpExtensionPackage;
+use StaticPHP\Util\FileSystem;
 
 #[Extension('mongodb')]
 class mongodb extends PhpExtensionPackage
 {
+    #[BeforeStage('php', [php::class, 'buildconfForWindows'], 'ext-mongodb')]
+    public function patchBeforeBuild(): void
+    {
+        FileSystem::replaceFileStr(
+            "{$this->getSourceDir()}/config.w32",
+            'ADD_FLAG("CFLAGS_MONGODB", "/D KMS_MESSAGE_LITTLE_ENDIAN=1 /D MONGOCRYPT_LITTLE_ENDIAN=1 /D MLIB_USER=1");',
+            'ADD_FLAG("CFLAGS_MONGODB", "/D KMS_MESSAGE_LITTLE_ENDIAN=1  /D MONGOCRYPT_LITTLE_ENDIAN=1 /D MLIB_USER=1");' . "\n    ADD_FLAG(\"CFLAGS_MONGODB\", \"/utf-8\");",
+        );
+    }
+
     #[CustomPhpConfigureArg('Darwin')]
     #[CustomPhpConfigureArg('Linux')]
     public function getUnixConfigureArg(bool $shared, PackageInstaller $installer): string