1 files changed, 2 insertions, 0 deletions
diff --git a/pp_sys.c b/pp_sys.c
index e71eecd208..1d0b552661 100644
--- a/pp_sys.c
+++ b/pp_sys.c
@@ -1485,6 +1485,8 @@ PP(pp_prtf)
 	goto just_say_no;
     }
     else {
+	if (SvTAINTED(MARK[1]))
+	    TAINT_PROPER("printf");
 	do_sprintf(sv, SP - MARK, MARK + 1);
 	if (!do_print(sv, fp))
 	    goto just_say_no;