diff --git a/main.go b/main.go
index 55ab0ec5..dfe01a62 100644
--- a/main.go
+++ b/main.go
@@ -77,11 +77,12 @@ func sourceFromArg(arg string) (*source, error) {
 
 	// a GitHub or GitLab URL (even without the protocol):
 	var dnsErr *net.DNSError
+	var opErr *net.OpError
 	src, err := readmeURL(arg)
 	if src != nil && err == nil {
 		// if there's an error, try next methods...
 		return src, nil
-	} else if err != nil && errors.As(err, &dnsErr) {
+	} else if err != nil && errors.As(err, &dnsErr) || errors.As(err, &opErr) {
 		// fail if there's a network error.
 		return src, err
 	}