diff --git a/arch/x86/events/msr.c b/arch/x86/events/msr.c
index ec863b9a9f780c7507634353d64f9c2f76f1a0e1..8bef19f098d4d065a48a5d3e4ecc36b8158fc0ac 100644
--- a/arch/x86/events/msr.c
+++ b/arch/x86/events/msr.c
@@ -166,7 +166,7 @@ static void msr_event_update(struct perf_event *event)
 	if (unlikely(event->hw.event_base == MSR_SMI_COUNT))
 		delta = sign_extend64(delta, 31);
 
-	local64_add(now - prev, &event->count);
+	local64_add(delta, &event->count);
 }
 
 static void msr_event_start(struct perf_event *event, int flags)