diff --git a/tailcfg/tailcfg.go b/tailcfg/tailcfg.go
index 23f3cc49b..fb7d54c38 100644
--- a/tailcfg/tailcfg.go
+++ b/tailcfg/tailcfg.go
@@ -2265,10 +2265,10 @@ type Debug struct {
 	Exit *int `json:",omitempty"`
 }
 
-func (id ID) String() string      { return fmt.Sprintf("id:%x", int64(id)) }
-func (id UserID) String() string  { return fmt.Sprintf("userid:%x", int64(id)) }
-func (id LoginID) String() string { return fmt.Sprintf("loginid:%x", int64(id)) }
-func (id NodeID) String() string  { return fmt.Sprintf("nodeid:%x", int64(id)) }
+func (id ID) String() string      { return fmt.Sprintf("id:%d", int64(id)) }
+func (id UserID) String() string  { return fmt.Sprintf("userid:%d", int64(id)) }
+func (id LoginID) String() string { return fmt.Sprintf("loginid:%d", int64(id)) }
+func (id NodeID) String() string  { return fmt.Sprintf("nodeid:%d", int64(id)) }
 
 // Equal reports whether n and n2 are equal.
 func (n *Node) Equal(n2 *Node) bool {