diff --git a/tcshrc.prompt.defs b/tcshrc.prompt.defs
index a9d5814..f9e4579 100644
--- a/tcshrc.prompt.defs
+++ b/tcshrc.prompt.defs
@@ -56,6 +56,9 @@ switch( $CSHENV_SYSTEM )
 	# Linux (and Cygwin) are not BSD behavior, and make cols the 7th entry be stty
 	case Cygwin:
 	case Linux:
+
+    # SYSV type systems seem to be settling on this as the common mechanism.
+    case SunOS:
 		if( $?CSHENV_DEBUG ) then
 			echo "Linux prompt width for stty blows..."
 		endif