--- src/dlg.c
+++ src/dlg.c
@@ -223,6 +223,12 @@ create_dlg (int y1, int x1, int lines, i
     if ((flags & DLG_TRYUP) && (y1 > 3))
 	y1 -= 2;
 
+    if (x1 < 0)
+	x1 = 0;
+	
+    if (y1 < 0)
+	y1 = 0;
+
     new_d = g_new0 (Dlg_head, 1);
     new_d->color = color_set;
     new_d->help_ctx = help_ctx;