diff --git a/mozilla/security/nss/lib/freebl/mpi/mpprime.c b/mozilla/security/nss/lib/freebl/mpi/mpprime.c
index eb1d61c60e8..c7eaef08c0a 100644
--- a/mozilla/security/nss/lib/freebl/mpi/mpprime.c
+++ b/mozilla/security/nss/lib/freebl/mpi/mpprime.c
@@ -341,16 +341,15 @@ mp_err  mpp_pprime(mp_int *a, int nt)
     for (jx = 1; jx < b; jx++) {
       /* z = z^2 (mod a) */
       MP_CHECKOK( mp_sqrmod(&z, a, &z) );
+      res = MP_NO;	/* previous line set res to MP_YES */
 
       if(mp_cmp_d(&z, 1) == 0) {
-	res = MP_NO;
 	break;
       }
       if(mp_cmp(&z, &amo) == 0) {
 	res = MP_YES;
 	break;
       } 
-      res = MP_NO;
     } /* end testing loop */
 
     /* If the test passes, we will continue iterating, but a failed