--- a/nss_core.c
+++ b/nss_core.c
@@ -1599,7 +1599,7 @@ static int32_t nss_core_handle_cause_que
 		 *
 		 */
 		if (unlikely((buffer_type == N2H_BUFFER_CRYPTO_RESP))) {
-			dma_unmap_single(NULL, (desc->buffer + desc->payload_offs), desc->payload_len, DMA_FROM_DEVICE);
+			dma_unmap_single(nss_ctx->dev, (desc->buffer + desc->payload_offs), desc->payload_len, DMA_FROM_DEVICE);
 			goto consume;
 		}