diff --git a/lib/test_runner.zig b/lib/test_runner.zig
index 42fdf3bec735..363212bdacb4 100644
--- a/lib/test_runner.zig
+++ b/lib/test_runner.zig
@@ -24,8 +24,6 @@ pub fn main() void {
     for (args[1..]) |arg| {
         if (std.mem.eql(u8, arg, "--listen=-")) {
             listen = true;
-        } else {
-            @panic("unrecognized command line argument");
         }
     }