diff --git a/HDF5Examples/C/H5T/h5ex_t_convert.c b/HDF5Examples/C/H5T/h5ex_t_convert.c
index b6f46b6f8fc..b7036e3e0c5 100644
--- a/HDF5Examples/C/H5T/h5ex_t_convert.c
+++ b/HDF5Examples/C/H5T/h5ex_t_convert.c
@@ -120,7 +120,7 @@ main(void)
      * Output the data to the screen.
      */
     for (i = 0; i < DIM0; i++) {
-        printf("sensor[%d]:\n", i);
+        printf("sensor[%" PRIuHSIZE "]:\n", i);
         printf("Serial number   : %d\n", sensor[i].serial_no);
         printf("Location        : %s\n", sensor[i].location);
         printf("Temperature (F) : %f\n", sensor[i].temperature);
diff --git a/HDF5Examples/C/H5T/h5ex_t_opaque.c b/HDF5Examples/C/H5T/h5ex_t_opaque.c
index 085183a1668..11a58aea2e0 100644
--- a/HDF5Examples/C/H5T/h5ex_t_opaque.c
+++ b/HDF5Examples/C/H5T/h5ex_t_opaque.c
@@ -111,7 +111,7 @@ main(void)
      */
     printf("Datatype tag for %s is: \"%s\"\n", DATASET, tag);
     for (i = 0; i < dims[0]; i++) {
-        printf("%s[%u]: ", DATASET, i);
+        printf("%s[%" PRIuHSIZE "]: ", DATASET, i);
         for (j = 0; j < len; j++)
             printf("%c", rdata[j + i * len]);
         printf("\n");