diff --git a/pkg/rules/rules.go b/pkg/rules/rules.go
index 08b0ebaae..1634b6bcb 100644
--- a/pkg/rules/rules.go
+++ b/pkg/rules/rules.go
@@ -113,7 +113,11 @@ func host(route *mux.Route, hosts ...string) error {
 	route.MatcherFunc(func(req *http.Request, _ *mux.RouteMatch) bool {
 		reqHost := requestdecorator.GetCanonizedHost(req.Context())
 		if len(reqHost) == 0 {
-			log.FromContext(req.Context()).Warnf("Could not retrieve CanonizedHost, rejecting %s", req.Host)
+			// If the request is an HTTP/1.0 request, then a Host may not be defined.
+			if req.ProtoAtLeast(1, 1) {
+				log.FromContext(req.Context()).Warnf("Could not retrieve CanonizedHost, rejecting %s", req.Host)
+			}
+
 			return false
 		}