diff --git a/src/PIL/ImageGrab.py b/src/PIL/ImageGrab.py
index a3519fa21..66e2e8560 100644
--- a/src/PIL/ImageGrab.py
+++ b/src/PIL/ImageGrab.py
@@ -101,4 +101,4 @@ def grabclipboard():
             return BmpImagePlugin.DibImageFile(io.BytesIO(data))
         return data
     else:
-        raise IOError("ImageGrab.grabclipboard() is macOS and Windows only")
+        raise NotImplementedError("ImageGrab.grabclipboard() is macOS and Windows only")