diff --git a/PIL/ImageQt.py b/PIL/ImageQt.py
index 88df3e564..fd662c894 100644
--- a/PIL/ImageQt.py
+++ b/PIL/ImageQt.py
@@ -18,12 +18,15 @@
 
 from PIL import Image
 from PIL._util import isPath
+import sys
 
-try:
+if 'PyQt4.QtGui' not in sys.modules:
+  try:
     from PyQt5.QtGui import QImage, qRgba
-except:
+  except:
     from PyQt4.QtGui import QImage, qRgba
-
+else: #PyQt4 is used
+  from PyQt4.QtGui import QImage, qRgba
 
 ##
 # (Internal) Turns an RGB color into a Qt compatible color integer.