diff --git a/src/PIL/ImageQt.py b/src/PIL/ImageQt.py
index a3d647138df..c0b03a8812d 100644
--- a/src/PIL/ImageQt.py
+++ b/src/PIL/ImageQt.py
@@ -159,7 +159,7 @@ def _toqclass_helper(im: Image.Image | str | QByteArray) -> dict[str, Any]:
         im = im.convert("RGBA")
 
         data = im.tobytes("raw", "BGRA")
-        format = getattr(qt_format, "Format_RGB32")
+        format = getattr(qt_format, "Format_ARGB32")
     elif im.mode == "RGBA":
         data = im.tobytes("raw", "BGRA")
         format = getattr(qt_format, "Format_ARGB32")