diff --git a/bin/ps/fmt.c b/bin/ps/fmt.c
index 3b6a1ec1c8b4..eee5813f977b 100644
--- a/bin/ps/fmt.c
+++ b/bin/ps/fmt.c
@@ -72,7 +72,7 @@ shquote(argv)
 			dst++;
 		*dst++ = ' ';
 	}
-	*dst = '\0';
+	*--dst = '\0';
 	return (buf);
 }