diff --git a/src/comp/driver/driver.rs b/src/comp/driver/driver.rs
index c779151f9513..d18c7bd29cff 100644
--- a/src/comp/driver/driver.rs
+++ b/src/comp/driver/driver.rs
@@ -613,8 +613,8 @@ mod test {
             alt getopts::getopts(["--test"], opts()) {
               ok(m) { m }
             };
-        let sessopts = build_session_options(match);
-        let sess = build_session(sessopts, "");
+        let sessopts = build_session_options(match, diagnostic::emit);
+        let sess = build_session(sessopts, "", diagnostic::emit);
         let cfg = build_configuration(sess, "whatever", "whatever");
         assert (attr::contains_name(cfg, "test"));
     }
@@ -627,8 +627,8 @@ mod test {
             alt getopts::getopts(["--test", "--cfg=test"], opts()) {
               ok(m) { m }
             };
-        let sessopts = build_session_options(match);
-        let sess = build_session(sessopts, "");
+        let sessopts = build_session_options(match, diagnostic::emit);
+        let sess = build_session(sessopts, "", diagnostic::emit);
         let cfg = build_configuration(sess, "whatever", "whatever");
         let test_items = attr::find_meta_items_by_name(cfg, "test");
         assert (vec::len(test_items) == 1u);