diff --git a/src/coe.c b/src/coe.c
index d573719..626a990 100644
--- a/src/coe.c
+++ b/src/coe.c
@@ -1063,7 +1063,7 @@ int ec_coe_sdo_entry_desc_read(ec_t *pec, osal_uint16_t slave, osal_uint16_t ind
                         desc->data_type     = read_buf->data_type;
                         desc->bit_length    = read_buf->bit_length;
                         desc->obj_access    = read_buf->obj_access;
-                        desc->data_len      = min(CANOPEN_MAXDATA, read_buf->mbx_hdr.length - 2u - 10u);
+                        desc->data_len      = min(CANOPEN_MAXDATA, read_buf->mbx_hdr.length - 6u - 10u);
 
                         (void)memcpy(desc->data, read_buf->desc_data, desc->data_len);
                         ret = EC_OK;