diff --git a/orte/mca/iof/hnp/iof_hnp.c b/orte/mca/iof/hnp/iof_hnp.c
index 18b082d0d6..3ab1b6dffc 100644
--- a/orte/mca/iof/hnp/iof_hnp.c
+++ b/orte/mca/iof/hnp/iof_hnp.c
@@ -163,7 +163,7 @@ static int hnp_push(const orte_process_name_t* dst_name, orte_iof_tag_t src_tag,
                 np = np / 10;
             }
             /* construct the filename */
-            asprintf(&outfile, "%s.%*0lu", orte_output_filename, numdigs, (unsigned long)proct->name.vpid);
+            asprintf(&outfile, "%s.%0*lu", orte_output_filename, numdigs, (unsigned long)proct->name.vpid);
             /* create the file */
             fdout = open(outfile, O_CREAT|O_RDWR|O_TRUNC, 0644);
             free(outfile);
diff --git a/orte/mca/iof/orted/iof_orted.c b/orte/mca/iof/orted/iof_orted.c
index 97c5ff2adb..31829701f4 100644
--- a/orte/mca/iof/orted/iof_orted.c
+++ b/orte/mca/iof/orted/iof_orted.c
@@ -149,7 +149,7 @@ static int orted_push(const orte_process_name_t* dst_name, orte_iof_tag_t src_ta
             np = np / 10;
         }
         /* construct the filename */
-        asprintf(&outfile, "%s.%*0lu", orte_output_filename, numdigs, (unsigned long)proct->name.vpid);
+        asprintf(&outfile, "%s.%0*lu", orte_output_filename, numdigs, (unsigned long)proct->name.vpid);
         /* create the file */
         fdout = open(outfile, O_CREAT|O_RDWR|O_TRUNC, 0644);
         free(outfile);