--- a/XWorkstation.st	Thu Jun 21 14:59:40 2018 +0000
+++ b/XWorkstation.st	Sat Feb 02 01:04:01 2019 +0000
@@ -1,5 +1,7 @@
 "
 COPYRIGHT (c) 1989 by Claus Gittinger
+COPYRIGHT (c) 2015 Claus Gittinger
+COPYRIGHT (c) 2015-2018 Jan Vrany
 	      All Rights Reserved
 
  This software is furnished under a license and may be used
@@ -700,6 +702,8 @@
 copyright
 "
 COPYRIGHT (c) 1989 by Claus Gittinger
+COPYRIGHT (c) 2015 Claus Gittinger
+COPYRIGHT (c) 2015-2018 Jan Vrany
 	      All Rights Reserved
 
  This software is furnished under a license and may be used
@@ -9513,7 +9517,7 @@
     super initializeScreenProperties.
 
     hasShapeExtension := self hasExtension:#SHAPE.
-    hasShmExtension := self hasExtension:#MIT_SHM.
+    hasShmExtension := self hasExtension:#'MIT-SHM'.
     hasDPSExtension := self hasExtension:#DPS.
     hasXVideoExtension := self hasExtension:#XVideo.
     hasMbufExtension := self hasExtension:#'Multi-Buffering'.