diff --git a/src/fe-text/gui-windows.c b/src/fe-text/gui-windows.c
index 02f225b8..e726715d 100644
--- a/src/fe-text/gui-windows.c
+++ b/src/fe-text/gui-windows.c
@@ -465,7 +465,7 @@ static void single_line_draw(GUI_WINDOW_REC *gui, int ypos,
 			continue;
 		}
 
-		if ((unsigned char) *text >= 32)
+		if (((unsigned char) *text & 127) >= 32)
 			waddch(cwin, (unsigned char) *text);
 		else {
 			/* low-ascii */