diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 5c6fae4..ff854fd 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -2666,6 +2666,7 @@
 		header.size += sizeof(cpu_entry);
 
 		cpu_entry.cpu = raw_smp_processor_id();
+		cpu_entry.reserved = 0;
 	}
 
 	if (sample_type & PERF_SAMPLE_PERIOD)