diff --git a/library/cipher.c b/library/cipher.c
index ccc0685..ecc3aec 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -141,7 +141,7 @@
     memset( ctx, 0, sizeof( mbedtls_cipher_context_t ) );
 
     if( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) )
-        return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED );
+        return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED ); // LCOV_EXCL_LINE
 
     ctx->cipher_info = cipher_info;