diff --git a/sys/dev/oce/oce_hw.h b/sys/dev/oce/oce_hw.h
index 4cdbea34aa00..9f1a92a37e94 100644
--- a/sys/dev/oce/oce_hw.h
+++ b/sys/dev/oce/oce_hw.h
@@ -1577,7 +1577,8 @@ struct mbx_common_read_write_flashrom {
 	uint32_t flash_op_type;
 	uint32_t data_buffer_size;
 	uint32_t data_offset;
-	uint8_t  data_buffer[4];	/* + IMAGE_TRANSFER_SIZE */
+	uint8_t  data_buffer[32768];	/* + IMAGE_TRANSFER_SIZE */
+	uint8_t  rsvd[4];
 };
 
 struct oce_phy_info {
diff --git a/sys/dev/oce/oce_sysctl.c b/sys/dev/oce/oce_sysctl.c
index 1155c699e1dd..cbb51f1429ed 100644
--- a/sys/dev/oce/oce_sysctl.c
+++ b/sys/dev/oce/oce_sysctl.c
@@ -381,8 +381,8 @@ oce_sh_be3_flashdata(POCE_SOFTC sc, const struct firmware *fw, int32_t num_imgs)
 		return EINVAL;
 	}
 
-	rc = oce_dma_alloc(sc, sizeof(struct mbx_common_read_write_flashrom)
-			+ 32*1024, &dma_mem, 0);
+	rc = oce_dma_alloc(sc, sizeof(struct mbx_common_read_write_flashrom),
+				&dma_mem, 0);
 	if (rc) {
 		device_printf(sc->dev,
 				"Memory allocation failure while flashing\n");