diff --git a/src/H5Pdxpl.c b/src/H5Pdxpl.c
index 6eef558de6..942d6f21de 100644
--- a/src/H5Pdxpl.c
+++ b/src/H5Pdxpl.c
@@ -2562,7 +2562,7 @@ H5Pget_selection_io(hid_t plist_id, H5D_selection_io_mode_t *selection_io_mode /
     herr_t          ret_value = SUCCEED; /* Return value */
 
     FUNC_ENTER_API(FAIL)
-    H5TRACE2("e", "i*DC", plist_id, selection_io_mode);
+    H5TRACE2("e", "ix", plist_id, selection_io_mode);
 
     /* Check arguments */
     if (NULL == (plist = H5P_object_verify(plist_id, H5P_DATASET_XFER)))
@@ -2727,7 +2727,7 @@ H5Pget_modify_write_buf(hid_t plist_id, hbool_t *modify_write_buf /*out*/)
     herr_t          ret_value = SUCCEED; /* Return value */
 
     FUNC_ENTER_API(FAIL)
-    H5TRACE2("e", "i*b", plist_id, modify_write_buf);
+    H5TRACE2("e", "ix", plist_id, modify_write_buf);
 
     /* Check arguments */
     if (NULL == (plist = H5P_object_verify(plist_id, H5P_DATASET_XFER)))