diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 93de3ac..f28799e 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -319,7 +319,7 @@
 {
 	struct addr_location al;
 
-	if (perf_event__preprocess_sample(event, machine, &al, sample, NULL) < 0) {
+	if (perf_event__preprocess_sample(event, machine, &al, sample) < 0) {
 		pr_warning("problem processing %d event, skipping it.\n",
 			   event->header.type);
 		return -1;