diff --git a/src/osmo-mgw/mgw_main.c b/src/osmo-mgw/mgw_main.c
index adc1751bc..4168e0dc3 100644
--- a/src/osmo-mgw/mgw_main.c
+++ b/src/osmo-mgw/mgw_main.c
@@ -132,6 +132,10 @@ static void handle_options(int argc, char **argv)
 			break;
 		};
 	}
+	if (argc > optind) {
+		fprintf(stderr, "Unsupported positional arguments on command line\n");
+		exit(2);
+	}
 }
 
 /* Callback function to be called when the RSIP ("Reset in Progress") mgcp