diff --git a/ompi/mca/common/portals/common_portals.c b/ompi/mca/common/portals/common_portals.c
index a27759bc53..07f7c4bdbe 100644
--- a/ompi/mca/common/portals/common_portals.c
+++ b/ompi/mca/common/portals/common_portals.c
@@ -107,9 +107,11 @@ ompi_common_portals_error_ptl_to_ompi(int ptl_error)
     case PTL_SR_INDEX_INVALID:
         ret = OMPI_ERR_BAD_PARAM;
         break;
+#if !OMPI_PORTALS_CRAYXT3
     case PTL_UNKNOWN_ERROR:
         ret = OMPI_ERROR;
         break;
+#endif
     default:
         ret = OMPI_ERROR;
     }
diff --git a/ompi/mca/common/portals/common_portals.h b/ompi/mca/common/portals/common_portals.h
index 1e0e5f4659..f27a463f16 100644
--- a/ompi/mca/common/portals/common_portals.h
+++ b/ompi/mca/common/portals/common_portals.h
@@ -38,6 +38,8 @@
 
 #include <portals/portals3.h>
 #define PTL_EQ_HANDLER_NONE NULL
+/* Cray's definition, differs from the spec */
+#define PTL_NO_ACK_REQ PTL_NOACK_REQ
 
 #define OMPI_BTL_PORTALS_SEND_TABLE_ID 30
 #define OMPI_BTL_PORTALS_RDMA_TABLE_ID 31