diff --git a/modules/caddyhttp/app.go b/modules/caddyhttp/app.go
index afa6cd0f0..a6ec37225 100644
--- a/modules/caddyhttp/app.go
+++ b/modules/caddyhttp/app.go
@@ -533,7 +533,7 @@ func (app *App) Start() error {
 					// create the listener for this socket
 					lnAny, err := listenAddr.Listen(app.ctx, portOffset, net.ListenConfig{
 						KeepAliveConfig: net.KeepAliveConfig{
-							Enable:   srv.KeepAliveInterval != 0,
+							Enable:   srv.KeepAliveInterval >= 0,
 							Interval: time.Duration(srv.KeepAliveInterval),
 						},
 					})