diff --git a/cmd/grpcurl/grpcurl.go b/cmd/grpcurl/grpcurl.go
index 013e2e1..887804d 100644
--- a/cmd/grpcurl/grpcurl.go
+++ b/cmd/grpcurl/grpcurl.go
@@ -290,7 +290,7 @@ func main() {
 			opts = append(opts, grpc.WithAuthority(*authority))
 		}
 		var creds credentials.TransportCredentials
-		if !*plaintext {
+		if !*insecure {
 			var err error
 			creds, err = grpcurl.ClientTransportCredentials(*insecure, *cacert, *cert, *key)
 			if err != nil {