diff --git a/generate_cert.go b/generate_cert.go
index 5b8c700..f461888 100644
--- a/generate_cert.go
+++ b/generate_cert.go
@@ -59,7 +59,7 @@ func main() {
 	certOut.Close()
 	log.Print("written cert.pem\n")
 
-	keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREAT|os.O_TRUNC, 0600)
+	keyOut, err := os.OpenFile("key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
 	if err != nil {
 		log.Print("failed to open key.pem for writing:", err)
 		return