diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 254883d0c7e088424ed983154613b4ad889435e1..6ed3ae4f54829411e62d286cd00222d3cb3e5020 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -68,8 +68,9 @@ union cpuid10_eax {
 
 union cpuid10_edx {
 	struct {
-		unsigned int num_counters_fixed:4;
-		unsigned int reserved:28;
+		unsigned int num_counters_fixed:5;
+		unsigned int bit_width_fixed:8;
+		unsigned int reserved:19;
 	} split;
 	unsigned int full;
 };