diff --git a/core/c/mpw-types.c b/core/c/mpw-types.c
index 0ed61e92..60fb1ca0 100644
--- a/core/c/mpw-types.c
+++ b/core/c/mpw-types.c
@@ -46,7 +46,7 @@ const MPResultType mpw_typeWithName(const char *typeName) {
             return MPResultTypeStatefulPersonal;
         if ('D' == typeName[0])
             return MPResultTypeStatefulDevice;
-        if ('k' == typeName[0])
+        if ('K' == typeName[0])
             return MPResultTypeDeriveKey;
     }
 
diff --git a/core/c/mpw-util.c b/core/c/mpw-util.c
index 56496a0e..7ce1159e 100644
--- a/core/c/mpw-util.c
+++ b/core/c/mpw-util.c
@@ -207,7 +207,6 @@ uint8_t const *mpw_kdf_blake2b(const size_t subkeySize, const uint8_t *key, cons
 #if MPW_SODIUM
     if (keySize < crypto_generichash_blake2b_KEYBYTES_MIN || keySize > crypto_generichash_blake2b_KEYBYTES_MAX ||
         subkeySize < crypto_generichash_blake2b_KEYBYTES_MIN || subkeySize > crypto_generichash_blake2b_KEYBYTES_MAX ||
-        contextSize < crypto_generichash_blake2b_BYTES_MIN || contextSize > crypto_generichash_blake2b_BYTES_MAX ||
         (personal && strlen( personal ) > crypto_generichash_blake2b_PERSONALBYTES)) {
         errno = EINVAL;
         free( subkey );