diff --git a/p2p/discover/node.go b/p2p/discover/node.go
index 3e9dcc74ea..8d4af166bb 100644
--- a/p2p/discover/node.go
+++ b/p2p/discover/node.go
@@ -34,7 +34,7 @@ import (
 type node struct {
 	enode.Node
 	addedAt        time.Time // time when the node was added to the table
-	livenessChecks int       // how often liveness was checked
+	livenessChecks uint      // how often liveness was checked
 }
 
 type encPubkey [64]byte