diff --git a/src/H5Dscatgath.c b/src/H5Dscatgath.c
index 62299dd4a4c..cd2027bdb07 100644
--- a/src/H5Dscatgath.c
+++ b/src/H5Dscatgath.c
@@ -541,9 +541,6 @@ H5D__scatgath_read(const H5D_io_info_t *io_info, const H5D_dset_io_info_t *dset_
                 (size_t)MIN(dset_info->type_info.request_nelmts, (dset_info->nelmts - smine_start));
         }
 
-        memset(tmp_buf, 0,
-               smine_nelmts * MAX(dset_info->type_info.src_type_size, dset_info->type_info.dst_type_size));
-
         /*
          * Gather the data from disk into the datatype conversion
          * buffer. Also gather data from application to background buffer
diff --git a/test/cmpd_dset.c b/test/cmpd_dset.c
index aff2ec5480e..628b5d018a6 100644
--- a/test/cmpd_dset.c
+++ b/test/cmpd_dset.c
@@ -1941,6 +1941,13 @@ create_stype4(void)
         H5Tinsert(tid, "t", HOFFSET(stype4, t), H5T_NATIVE_LLONG) < 0)
         goto error;
 
+        printf("HOFFSET for stype4: a=%zu, b=%zu, c=%zu, d=%zu, e=%zu, f=%zu, g=%zu, h=%zu, i=%zu, j=%zu, k=%zu, l=%zu, m=%zu, n=%zu, o=%zu, p=%zu, q=%zu, r=%zu, s=%zu, t=%zu; TOT=%zu\n",
+            HOFFSET(stype4, a), HOFFSET(stype4, b), HOFFSET(stype4, c), HOFFSET(stype4, d), HOFFSET(stype4, e),\
+            HOFFSET(stype4, f), HOFFSET(stype4, g), HOFFSET(stype4, h), HOFFSET(stype4, i), HOFFSET(stype4, j),\
+            HOFFSET(stype4, k), HOFFSET(stype4, l), HOFFSET(stype4, m), HOFFSET(stype4, n), HOFFSET(stype4, o),\
+            HOFFSET(stype4, p), HOFFSET(stype4, q), HOFFSET(stype4, r), HOFFSET(stype4, s), HOFFSET(stype4, t),
+            H5Tget_size(tid));
+
     if (H5Tclose(array_dt1) < 0)
         goto error;
     if (H5Tclose(array_dt2) < 0)