diff --git a/src/jrd/dpm.epp b/src/jrd/dpm.epp
index baa65b6f8b..4b4c8b901a 100644
--- a/src/jrd/dpm.epp
+++ b/src/jrd/dpm.epp
@@ -725,7 +725,7 @@ void DPM_delete( thread_db* tdbb, record_param* rpb, SLONG prior_page)
 #ifdef VIO_DEBUG
 	if (debug_flag > DEBUG_WRITES)
 	{
-		printf("DPM_delete (record_param %"QUADFORMAT", prior_page %"SLONGFORMAT")\n",
+		printf("DPM_delete (record_param %"QUADFORMAT"d, prior_page %"SLONGFORMAT")\n",
 		           rpb->rpb_number.getValue(), prior_page);
 	}
 	if (debug_flag > DEBUG_WRITES_INFO)