diff --git a/core/sys/linux/bits.odin b/core/sys/linux/bits.odin
index 0cf90ed3b..1ca60d494 100644
--- a/core/sys/linux/bits.odin
+++ b/core/sys/linux/bits.odin
@@ -718,7 +718,7 @@ Perf_Event_Sample_Type_Bits :: enum {
 }
 
 /// Describes field sets to include in mmaped page
-Perf_Read_Format :: enum {
+Perf_Read_Format_Bits :: enum {
 	TOTAL_TIME_ENABLED = 0,
 	TOTAL_TIME_RUNNING = 1,
 	ID                 = 2,
diff --git a/core/sys/linux/types.odin b/core/sys/linux/types.odin
index 8789ca2d1..afa7faf33 100644
--- a/core/sys/linux/types.odin
+++ b/core/sys/linux/types.odin
@@ -283,6 +283,8 @@ Perf_Flags :: bit_set[Perf_Flags_Bits; uint]
 
 Perf_Event_Flags :: distinct bit_set[Perf_Event_Flags_Bits; u64]
 
+Perf_Read_Format :: distinct bit_set[Perf_Read_Format_Bits; u64]
+
 Perf_Cap_Flags :: distinct bit_set[Perf_Cap_Flags_Bits; u64]
 
 Perf_Event_Sample_Type :: bit_set[Perf_Event_Sample_Type_Bits; u64]