diff --git a/tools/test/h5repack/h5repacktst.c b/tools/test/h5repack/h5repacktst.c
index e3c34fe82ab..784ebc78651 100644
--- a/tools/test/h5repack/h5repacktst.c
+++ b/tools/test/h5repack/h5repacktst.c
@@ -4682,8 +4682,8 @@ make_dset_reg_ref(hid_t loc_id)
     int              retval = -1;         /* return value */
 
     /* Allocate write & read buffers */
-    wbuf  = (hdset_reg_ref_t *)calloc(sizeof(hdset_reg_ref_t), (size_t)SPACE1_DIM1);
-    dwbuf = (int *)malloc(sizeof(int) * SPACE2_DIM1 * SPACE2_DIM2);
+    wbuf  = (hdset_reg_ref_t *)calloc(SPACE1_DIM1, sizeof(hdset_reg_ref_t));
+    dwbuf = (int *)malloc((SPACE2_DIM1 * SPACE2_DIM2) * sizeof(int));
 
     /* Create dataspace for datasets */
     if ((sid2 = H5Screate_simple(SPACE2_RANK, dims2, NULL)) < 0)