diff --git a/src/modes/ctr/ctr_encrypt.c b/src/modes/ctr/ctr_encrypt.c
index ecc7b01..7319cf5 100644
--- a/src/modes/ctr/ctr_encrypt.c
+++ b/src/modes/ctr/ctr_encrypt.c
@@ -53,6 +53,8 @@ int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, s
       if ((err = cipher_descriptor[ctr->cipher].accel_ctr_encrypt(pt, ct, len/ctr->blocklen, ctr->ctr, ctr->mode, &ctr->key)) != CRYPT_OK) {
          return err;
       }
+      pt += (len / ctr->blocklen) * ctr->blocklen;
+      ct += (len / ctr->blocklen) * ctr->blocklen;
       len %= ctr->blocklen;
    }