diff --git a/bin/sh/parser.c b/bin/sh/parser.c
index 53d7923f8755..d324d88a8f18 100644
--- a/bin/sh/parser.c
+++ b/bin/sh/parser.c
@@ -1930,6 +1930,8 @@ static void
 setprompt(int which)
 {
 	whichprompt = which;
+	if (which == 0)
+		return;
 
 #ifndef NO_HISTORY
 	if (!el)