diff --git a/tools/vm/page-types.c b/tools/vm/page-types.c
index bcf5ec760eb9..5a6016224bb9 100644
--- a/tools/vm/page-types.c
+++ b/tools/vm/page-types.c
@@ -128,6 +128,7 @@ static const char * const page_flag_names[] = {
 	[KPF_THP]		= "t:thp",
 	[KPF_BALLOON]		= "o:balloon",
 	[KPF_ZERO_PAGE]		= "z:zero_page",
+	[KPF_IDLE]              = "i:idle_page",
 
 	[KPF_RESERVED]		= "r:reserved",
 	[KPF_MLOCKED]		= "m:mlocked",