diff --git a/procps/pstree.c b/procps/pstree.c
index 54a910f76..180d0939a 100644
--- a/procps/pstree.c
+++ b/procps/pstree.c
@@ -373,7 +373,7 @@ int pstree_main(int argc UNUSED_PARAM, char **argv)
 
 	INIT_G();
 
-	get_terminal_width_height(1, &G.output_width, NULL);
+	get_terminal_width_height(0, &G.output_width, NULL);
 
 	opt_complementary = "?1";
 	getopt32(argv, "p");