diff --git a/composer.json b/composer.json
index 55d2bdde..6fe00d85 100644
--- a/composer.json
+++ b/composer.json
@@ -117,4 +117,4 @@
             "dev-master": "0.1-dev"
         }
     }
-}
+}
\ No newline at end of file
diff --git a/generated/functionsList.php b/generated/functionsList.php
index dba87129..18bc42e7 100644
--- a/generated/functionsList.php
+++ b/generated/functionsList.php
@@ -367,6 +367,7 @@
     'imagegd2',
     'imagegif',
     'imagegrabscreen',
+    'imagegrabwindow',
     'imagejpeg',
     'imagelayereffect',
     'imageline',
diff --git a/generated/image.php b/generated/image.php
index 38c7df36..b1fdfc36 100644
--- a/generated/image.php
+++ b/generated/image.php
@@ -1845,6 +1845,26 @@ function imagegrabscreen()
 }
 
 
+/**
+ * Grabs a window or its client area using a windows handle (HWND property in COM instance)
+ *
+ * @param int $handle The HWND window ID.
+ * @param bool $client_area Include the client area of the application window.
+ * @return \GdImage Returns an image object on success, FALSE on failure.
+ * @throws ImageException
+ *
+ */
+function imagegrabwindow(int $handle, bool $client_area = false): \GdImage
+{
+    error_clear_last();
+    $result = \imagegrabwindow($handle, $client_area);
+    if ($result === false) {
+        throw ImageException::createFromPhpError();
+    }
+    return $result;
+}
+
+
 /**
  * imagejpeg creates a JPEG file from
  * the given image.
diff --git a/generator/config/ignoredFunctions.php b/generator/config/ignoredFunctions.php
index 50eac18c..6e0554e9 100644
--- a/generator/config/ignoredFunctions.php
+++ b/generator/config/ignoredFunctions.php
@@ -16,5 +16,4 @@
     'apcu_delete', // apcu_delete returns false when the $key does not exist in the cache store
     'filter_has_var', // this function is meant to return a boolean
     'array_multisort', // this function is too buggy, see PR #113 on GitHub
-    'imagegrabwindow',
 ];
diff --git a/generator/src/PhpStanFunctions/CustomPhpStanFunctionMap.php b/generator/src/PhpStanFunctions/CustomPhpStanFunctionMap.php
index a2789136..d5d854fd 100644
--- a/generator/src/PhpStanFunctions/CustomPhpStanFunctionMap.php
+++ b/generator/src/PhpStanFunctions/CustomPhpStanFunctionMap.php
@@ -13,4 +13,5 @@
     'imagerotate' => ['resource|false', 'src_im'=>'resource', 'angle'=>'float', 'bgdcolor'=>'int', 'ignoretransparent='=>'bool'], //ignoretransparent is a bool instead of a int
     'pg_pconnect' => ['resource|false', 'connection_string'=>'string', 'flags' => 'int'], //flags is an int instead of a string
     'get_headers' => ['array|false', 'url'=>'string', 'format='=>'bool', 'context='=>'resource'], // format is a bool instead of int
+    'imagegrabwindow' => ['GdImage|false', 'handle'=>'int', 'client_area'=>'bool'], // client_ara is a bool instead of an int
 ];
diff --git a/rector-migrate.php b/rector-migrate.php
index bd610044..adb15ac6 100644
--- a/rector-migrate.php
+++ b/rector-migrate.php
@@ -377,6 +377,7 @@
             'imagegd2' => 'Safe\imagegd2',
             'imagegif' => 'Safe\imagegif',
             'imagegrabscreen' => 'Safe\imagegrabscreen',
+            'imagegrabwindow' => 'Safe\imagegrabwindow',
             'imagejpeg' => 'Safe\imagejpeg',
             'imagelayereffect' => 'Safe\imagelayereffect',
             'imageline' => 'Safe\imageline',