1 files changed, 4 insertions, 1 deletions
diff --git a/testpar/t_coll_chunk.c b/testpar/t_coll_chunk.c
index 104460a..20efaa1 100644
--- a/testpar/t_coll_chunk.c
+++ b/testpar/t_coll_chunk.c
@@ -832,7 +832,10 @@ coll_chunktest(const char *filename, int chunk_factor, int select_factor, int ap
     VRFY((status >= 0), "dataset write succeeded");
 
 #ifdef H5_HAVE_INSTRUMENTED_LIBRARY
-    if (facc_type == FACC_MPIO) {
+    /* Only check chunk optimization mode if selection I/O is not being used -
+     * selection I/O bypasses this IO mode decision - it's effectively always
+     * multi chunk currently */
+    if (facc_type == FACC_MPIO && !H5_use_selection_io_g) {
         switch (api_option) {
             case API_LINK_HARD:
                 status = H5Pget(xfer_plist, H5D_XFER_COLL_CHUNK_LINK_HARD_NAME, &prop_value);