diff --git a/library/nist_kw.c b/library/nist_kw.c
index 176af9f..317a242 100644
--- a/library/nist_kw.c
+++ b/library/nist_kw.c
@@ -311,7 +311,7 @@
     }
     mbedtls_platform_zeroize( inbuff, KW_SEMIBLOCK_LENGTH * 2 );
     mbedtls_platform_zeroize( outbuff, KW_SEMIBLOCK_LENGTH * 2 );
-    mbedtls_cipher_finish( &ctx->cipher_ctx, NULL, &olen );
+
     return( ret );
 }
 
@@ -528,7 +528,7 @@
     mbedtls_platform_zeroize( &bad_padding, sizeof( bad_padding) );
     mbedtls_platform_zeroize( &diff, sizeof( diff ) );
     mbedtls_platform_zeroize( A, sizeof( A ) );
-    mbedtls_cipher_finish( &ctx->cipher_ctx, NULL, &olen );
+
     return( ret );
 }