diff --git a/src/test/harness/reftest/reftest.rs b/src/test/harness/reftest/reftest.rs
index e4ee78a8590..c73ff9f167e 100644
--- a/src/test/harness/reftest/reftest.rs
+++ b/src/test/harness/reftest/reftest.rs
@@ -22,13 +22,16 @@ use extra::test::run_tests_console;
 
 fn main() {
     let args = os::args();
-    if args.len() < 2 {
-        println("error: at least one reftest list must be given");
-        os::set_exit_status(1);
-        return;
+    let mut parts = args.tail().split(|e| "--" == e.as_slice());
+
+    let files = parts.next().unwrap();  // .split() is never empty
+    let servo_args = parts.next().unwrap_or(&[]);
+
+    if files.len() == 0 {
+        fail!("error: at least one reftest list must be given");
     }
 
-    let tests = parse_lists(args.tail());
+    let tests = parse_lists(files, servo_args);
     let test_opts = TestOpts {
         filter: None,
         run_ignored: false,
@@ -57,9 +60,10 @@ struct Reftest {
     kind: ReftestKind,
     files: [~str, ..2],
     id: uint,
+    servo_args: ~[~str],
 }
 
-fn parse_lists(filenames: &[~str]) -> ~[TestDescAndFn] {
+fn parse_lists(filenames: &[~str], servo_args: &[~str]) -> ~[TestDescAndFn] {
     let mut tests: ~[TestDescAndFn] = ~[];
     let mut next_id = 0;
     for file in filenames.iter() {
@@ -97,6 +101,7 @@ fn parse_lists(filenames: &[~str]) -> ~[TestDescAndFn] {
                 kind: kind,
                 files: [file_left, file_right],
                 id: next_id,
+                servo_args: servo_args.to_owned(),
             };
 
             next_id += 1;
@@ -123,7 +128,9 @@ fn make_test(reftest: Reftest) -> TestDescAndFn {
 
 fn capture(reftest: &Reftest, side: uint) -> png::Image {
     let filename = format!("/tmp/servo-reftest-{:06u}-{:u}.png", reftest.id, side);
-    let args = ~[~"-f", ~"-o", filename.clone(), reftest.files[side].clone()];
+    let mut args = reftest.servo_args.clone();
+    args.push_all_move(~[~"-f", ~"-o", filename.clone(), reftest.files[side].clone()]);
+
     let mut process = Process::new("./servo", args, ProcessOptions::new()).unwrap();
     let retval = process.finish();
     assert!(retval == ExitStatus(0));