diff --git a/components/mbedtls/library/cipher.c b/components/mbedtls/library/cipher.c
index 273997577b687361f09faded2b59b4054bc3f6e1..4367b88ff742e28b19ed066b1dc4864ac38c8f25 100644
--- a/components/mbedtls/library/cipher.c
+++ b/components/mbedtls/library/cipher.c
@@ -459,11 +459,6 @@ int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, const unsigned char *i
          */
         if( 0 != ilen )
         {
-            if( 0 == block_size )
-            {
-                return( MBEDTLS_ERR_CIPHER_INVALID_CONTEXT );
-            }
-
             /* Encryption: only cache partial blocks
              * Decryption w/ padding: always keep at least one whole block
              * Decryption w/o padding: only cache partial blocks