diff --git a/.travis.yml b/.travis.yml
index 041eead..2393927 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,6 +40,7 @@ env:
 matrix:
   allow_failures:
     - env: RACKET_VERSION=HEAD
+    - env: RACKET_VERSION=HEADCS
     - env: RACKET_VERSION=RELEASE
   # Fast finish: Overall build result is determined as soon as any of
   # its rows have failed, or, all of its rows that aren't allowed to