diff --git a/.travis.yml b/.travis.yml
index 563e7c1..68b06e1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -28,9 +28,9 @@ env:
     #- RACKET_VERSION=6.4
     #- RACKET_VERSION=6.5
     #- RACKET_VERSION=6.6
-    - RACKET_VERSION=6.8
-    - RACKET_VERSION=6.9
-    - RACKET_VERSION=HEAD
+    - RACKET_VERSION=6.8  COVER=false
+    - RACKET_VERSION=6.9  COVER=true
+    - RACKET_VERSION=HEAD COVER=true
 
 matrix:
   allow_failures:
@@ -53,12 +53,12 @@ before_script:
 script:
  - raco test -p phc-graph
  - raco setup --check-pkg-deps --no-zo --no-launcher --no-install --no-post-install --no-docs --pkgs phc-graph
- - raco pkg install --deps search-auto doc-coverage
- - raco doc-coverage phc-graph
+ - if $COVER; then raco pkg install --deps search-auto doc-coverage; fi
+ - if $COVER; then raco doc-coverage phc-graph; fi
 
 after_success:
- - raco pkg install --deps search-auto cover cover-coveralls
- - raco cover -b -f coveralls -d $TRAVIS_BUILD_DIR/coverage .
+ - if $COVER; then raco pkg install --deps search-auto cover cover-coveralls; fi
+ - if $COVER; then raco cover -b -f coveralls -d $TRAVIS_BUILD_DIR/coverage .; fi
 
 after_success:
  - sh ./auto-push-master.sh