diff --git a/usr.bin/indent/args.c b/usr.bin/indent/args.c
index 737b844b88a0..883519014467 100644
--- a/usr.bin/indent/args.c
+++ b/usr.bin/indent/args.c
@@ -96,6 +96,7 @@ struct pro {
 
     {"T", PRO_SPECIAL, 0, KEY, 0},
     {"U", PRO_SPECIAL, 0, KEY_FILE, 0},
+    {"P", PRO_SPECIAL, 0, IGN, 0},
     {"bacc", PRO_BOOL, false, ON, &blanklines_around_conditional_compilation},
     {"badp", PRO_BOOL, false, ON, &blanklines_after_declarations_at_proctop},
     {"bad", PRO_BOOL, false, ON, &blanklines_after_declarations},