diff --git a/wolfcrypt/src/asn.c b/wolfcrypt/src/asn.c
index eb8e4671a..a29ecd11b 100644
--- a/wolfcrypt/src/asn.c
+++ b/wolfcrypt/src/asn.c
@@ -10187,7 +10187,7 @@ int wc_OBJ_sn2nid(const char *sn)
         sn = "SECP256R1";
     /* OpenSSL allows lowercase curve names */
     for (i = 0; i < (int)(sizeof(curveName) - 1) && *sn; i++) {
-        curveName[i] = (char)XTOUPPER((unsigned int) *sn++);
+        curveName[i] = (char)XTOUPPER((unsigned char) *sn++);
     }
     curveName[i] = '\0';
     /* find based on name and return NID */
diff --git a/wolfcrypt/src/evp.c b/wolfcrypt/src/evp.c
index acf2763f8..61bef46d6 100644
--- a/wolfcrypt/src/evp.c
+++ b/wolfcrypt/src/evp.c
@@ -3695,7 +3695,7 @@ const WOLFSSL_EVP_MD *wolfSSL_EVP_get_digestbyname(const char *name)
     const struct s_ent *ent;
 
     for (i = 0; i < sizeof(nameUpper) && name[i] != '\0'; i++) {
-        nameUpper[i] = (char)XTOUPPER((unsigned int) name[i]);
+        nameUpper[i] = (char)XTOUPPER((unsigned char) name[i]);
     }
     if (i < sizeof(nameUpper))
         nameUpper[i] = '\0';