--- a/lib/freebl/ppc-gcm-wrap.c
+++ b/lib/freebl/ppc-gcm-wrap.c
@@ -150,17 +150,17 @@ ppc_aes_gcmInitCounter(ppc_AES_GCMContex
                         AES_BLOCK_SIZE, AES_BLOCK_SIZE);
     if (rv != SECSuccess) {
         return SECFailure;
     }
 
     /* Promote the counter by 1 */
     gcm->CTR[14] += !(++gcm->CTR[15]);
     gcm->CTR[13] += !(gcm->CTR[15]) && !(gcm->CTR[14]);
-    gcm->CTR[12] += !(gcm->CTR[15]) && !(gcm->CTR[13]) && !(gcm->CTR[12]);
+    gcm->CTR[12] += !(gcm->CTR[15]) && !(gcm->CTR[14]) && !(gcm->CTR[13]);
 
     /* Now hash AAD - it would actually make sense to seperate the context
      * creation from the AAD, because that would allow to reuse the H, which
      * only changes when the AES key changes, and not every package, like the
      * IV and AAD */
     ppc_aes_gcmHASH(gcm->Htbl, aad, aadLen, gcm->T);
     gcm->Alen += aadLen;
     return SECSuccess;