diff --git a/ompi/mca/btl/gm/btl_gm.c b/ompi/mca/btl/gm/btl_gm.c
index 7a60b7b879..1bc33a6ec0 100644
--- a/ompi/mca/btl/gm/btl_gm.c
+++ b/ompi/mca/btl/gm/btl_gm.c
@@ -388,7 +388,7 @@ mca_btl_base_descriptor_t* mca_btl_gm_prepare_dst(
         return NULL;
     }
 
-    ompi_ddt_type_lb(convertor, &lb);
+    ompi_ddt_type_lb(convertor->pDesc, &lb);
     frag->segment.seg_len = *size;
     frag->segment.seg_addr.pval = convertor->pBaseBuf + lb + convertor->bConverted;
 
diff --git a/ompi/mca/btl/mvapi/btl_mvapi.c b/ompi/mca/btl/mvapi/btl_mvapi.c
index de60778ad6..290e5a0f31 100644
--- a/ompi/mca/btl/mvapi/btl_mvapi.c
+++ b/ompi/mca/btl/mvapi/btl_mvapi.c
@@ -467,7 +467,7 @@ mca_btl_base_descriptor_t* mca_btl_mvapi_prepare_dst(
         return NULL; 
     }
     
-    ompi_ddt_type_lb(convertor, &lb);
+    ompi_ddt_type_lb(convertor->pDesc, &lb);
     frag->segment.seg_len = *size; 
     frag->segment.seg_addr.pval = convertor->pBaseBuf + lb + convertor->bConverted; 
     frag->base.des_flags = 0; 
diff --git a/ompi/mca/btl/openib/btl_openib.c b/ompi/mca/btl/openib/btl_openib.c
index 493ba1993f..96f66491ed 100644
--- a/ompi/mca/btl/openib/btl_openib.c
+++ b/ompi/mca/btl/openib/btl_openib.c
@@ -468,7 +468,7 @@ mca_btl_base_descriptor_t* mca_btl_openib_prepare_dst(
         return NULL; 
     }
     
-    ompi_ddt_type_lb(convertor, &lb);
+    ompi_ddt_type_lb(convertor->pDesc, &lb);
     frag->segment.seg_len = *size; 
     frag->segment.seg_addr.pval = convertor->pBaseBuf + lb + convertor->bConverted; 
     frag->base.des_flags = 0;