diff --git a/cmd/syncthing/random.go b/cmd/syncthing/random.go
index 157056bf1..e51ce7f2a 100644
--- a/cmd/syncthing/random.go
+++ b/cmd/syncthing/random.go
@@ -49,9 +49,9 @@ func randomString(l int) string {
 // randomInt64 returns a strongly random int64, slowly
 func randomInt64() int64 {
 	var bs [8]byte
-	n, err := io.ReadFull(cryptoRand.Reader, bs[:])
-	if n != 8 || err != nil {
-		panic("randomness failure")
+	_, err := io.ReadFull(cryptoRand.Reader, bs[:])
+	if err != nil {
+		panic("randomness failure: " + err.Error())
 	}
 	return seedFromBytes(bs[:])
 }