diff --git a/travis.sh b/travis.sh
index c498462e..4ef4931b 100755
--- a/travis.sh
+++ b/travis.sh
@@ -55,6 +55,7 @@ else
     channel build
     cd "$DIR/test_suite"
     channel test --features unstable
+    channel build --tests --features proc-macro2/nightly
     if [ -z "${APPVEYOR}" ]; then
         cd "$DIR/test_suite/no_std"
         channel build