diff --git a/examples/afpacket/afpacket.go b/examples/afpacket/afpacket.go
index cec49de55..ea432383e 100644
--- a/examples/afpacket/afpacket.go
+++ b/examples/afpacket/afpacket.go
@@ -143,6 +143,7 @@ func main() {
 		if err != nil {
 			log.Fatal(err)
 		}
+		defer f.Close()
 		if err := pprof.StartCPUProfile(f); err != nil {
 			log.Fatal(err)
 		}