diff --git a/.travis.yml b/.travis.yml
index aa907bc..5dab599 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,7 +25,7 @@ env:
 # having them count against the overall success/failure.
 matrix:
   allow_failures:
-    # - env: RACKET_VERSION=HEAD
+    - env: RACKET_VERSION=HEAD
     - env: RACKET_VERSION=HEADCS
   # 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