diff --git a/build-aux/gen-thumbnailer.py b/build-aux/gen-thumbnailer.py
index 05ac821..5db039f 100644
--- a/build-aux/gen-thumbnailer.py
+++ b/build-aux/gen-thumbnailer.py
@@ -29,6 +29,9 @@ if os.name == 'nt':
 
 cmd = args.printer
 
+if os.environ.get('NEED_WINE', ''):
+    cmd = [os.environ['WINE'], cmd]
+
 mimetypes_out = subprocess.Popen(cmd, env=newenv, stdout=subprocess.PIPE).communicate()[0]
 if not mimetypes_out:
     sys.exit(1)