diff --git a/crypto_kem/kyber768/clean/kem.c b/crypto_kem/kyber768/clean/kem.c
index 65694306..2697d79c 100644
--- a/crypto_kem/kyber768/clean/kem.c
+++ b/crypto_kem/kyber768/clean/kem.c
@@ -84,25 +84,25 @@ int PQCLEAN_KYBER768_crypto_kem_dec(unsigned char *ss, const unsigned char *ct,
     unsigned char cmp[KYBER_CIPHERTEXTBYTES];
     unsigned char buf[2 * KYBER_SYMBYTES];
     unsigned char
-    kr[2 * KYBER_SYMBYTES];                                                                      /* Will contain key, coins, qrom-hash */
+    kr[2 * KYBER_SYMBYTES];                                                                                     /* Will contain key, coins, qrom-hash */
     const unsigned char *pk = sk + KYBER_INDCPA_SECRETKEYBYTES;
 
     PQCLEAN_KYBER768_indcpa_dec(buf, ct, sk);
 
-    for (i = 0; i < KYBER_SYMBYTES; i++) {                                                       /* Multitarget countermeasure for coins + contributory KEM */
-        buf[KYBER_SYMBYTES + i] = sk[KYBER_SECRETKEYBYTES - 2 * KYBER_SYMBYTES + i];             /* Save hash by storing H(pk) in sk */
+    for (i = 0; i < KYBER_SYMBYTES; i++) {                                                                      /* Multitarget countermeasure for coins + contributory KEM */
+        buf[KYBER_SYMBYTES + i] = sk[KYBER_SECRETKEYBYTES - 2 * KYBER_SYMBYTES + i];                            /* Save hash by storing H(pk) in sk */
     }
     sha3_512(kr, buf, 2 * KYBER_SYMBYTES);
 
-    PQCLEAN_KYBER768_indcpa_enc(cmp, buf, pk, kr + KYBER_SYMBYTES);                              /* coins are in kr+KYBER_SYMBYTES */
+    PQCLEAN_KYBER768_indcpa_enc(cmp, buf, pk, kr + KYBER_SYMBYTES);                                             /* coins are in kr+KYBER_SYMBYTES */
 
     fail = PQCLEAN_KYBER768_verify(ct, cmp, KYBER_CIPHERTEXTBYTES);
 
-    sha3_256(kr + KYBER_SYMBYTES, ct, KYBER_CIPHERTEXTBYTES);                                    /* overwrite coins in kr with H(c)  */
+    sha3_256(kr + KYBER_SYMBYTES, ct, KYBER_CIPHERTEXTBYTES);                                                   /* overwrite coins in kr with H(c)  */
 
-    PQCLEAN_KYBER768_cmov(kr, sk + KYBER_SECRETKEYBYTES - KYBER_SYMBYTES, KYBER_SYMBYTES, fail); /* Overwrite pre-k with z on re-encryption failure */
+    PQCLEAN_KYBER768_cmov(kr, sk + KYBER_SECRETKEYBYTES - KYBER_SYMBYTES, KYBER_SYMBYTES, (unsigned char)fail); /* Overwrite pre-k with z on re-encryption failure */
 
-    sha3_256(ss, kr, 2 * KYBER_SYMBYTES);                                                        /* hash concatenation of pre-k and H(c) to k */
+    sha3_256(ss, kr, 2 * KYBER_SYMBYTES);                                                                       /* hash concatenation of pre-k and H(c) to k */
 
     return 0;
 }