diff --git a/soes/esc_coe.c b/soes/esc_coe.c
index 2e35391..9c61724 100644
--- a/soes/esc_coe.c
+++ b/soes/esc_coe.c
@@ -203,6 +203,15 @@ uint16_t sizeOfPDO (uint16_t index, int * nmappings, _SMmap * mappings,
                   }
 
                   mappings[mapIx].obj = mapping;
+                  /* Save object list reference */
+                  if(mapping != NULL)
+                  {
+                     mappings[mapIx].objectlistitem = &SDOobjects[nidx];
+                  }
+                  else
+                  {
+                     mappings[mapIx].objectlistitem = NULL;
+                  }
                   mappings[mapIx++].offset = offset;
                }
 
diff --git a/soes/esc_coe.h b/soes/esc_coe.h
index 109cb5f..4ba8b87 100644
--- a/soes/esc_coe.h
+++ b/soes/esc_coe.h
@@ -40,6 +40,7 @@ typedef struct
 typedef struct
 {
    const _objd * obj;
+   const _objectlist * objectlistitem;
    uint16_t offset;
 } _SMmap;