diff --git a/usr.bin/su/su.c b/usr.bin/su/su.c
index 627a35bde25c..6ad691cf0df8 100644
--- a/usr.bin/su/su.c
+++ b/usr.bin/su/su.c
@@ -172,7 +172,7 @@ main(int argc, char *argv[])
 	au_id_t		 auid;
 #endif
 
-	shell = class = cleanenv = NULL;
+	p = shell = class = cleanenv = NULL;
 	asme = asthem = fastlogin = statusp = 0;
 	user = "root";
 	iscsh = UNSET;