diff --git a/bin/sh/histedit.c b/bin/sh/histedit.c
index b76d73d6583a..d92a7a330c5a 100644
--- a/bin/sh/histedit.c
+++ b/bin/sh/histedit.c
@@ -168,6 +168,7 @@ sethistsize(hs)
 		   (histsize = atoi(hs)) < 0)
 			histsize = 100;
 		history(hist, &he, H_SETSIZE, histsize);
+		history(hist, &he, H_SETUNIQUE, 1);
 	}
 }