diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 8ec6c93b7f..5dd9403045 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -7,6 +7,7 @@ This file contains a high-level description of this package's evolution. Release
 
 ## 4.9.3 - TBD
 
+* Obviate a number of irrelevant warnings. See [Github #2781](https://github.com/Unidata/netcdf-c/pull/2781).
 * Improve the speed and data quantity for DAP4 queries. See [Github #2765](https://github.com/Unidata/netcdf-c/pull/2765).
 * Remove the use of execinfo to programmatically dump the stack; it never worked. See [Github #2789](https://github.com/Unidata/netcdf-c/pull/2789).
 * Update the internal copy of tinyxml2 to latest code. See [Github #2771](https://github.com/Unidata/netcdf-c/pull/2771).
diff --git a/include/nc4internal.h b/include/nc4internal.h
index f9925b1dea..9182c69800 100644
--- a/include/nc4internal.h
+++ b/include/nc4internal.h
@@ -131,7 +131,7 @@ typedef struct NC_OBJ
 {
     NC_SORT sort; /**< Type of object. */
     char* name;   /**< Name, assumed to be null terminated. */
-    size_t id;    /**< This objects ID. */
+    int id;    /**< This objects ID. */
 } NC_OBJ;
 
 /**