diff --git a/.travis.yml b/.travis.yml
index 3534abb1ae7a..336ab8e97949 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -51,9 +51,9 @@ addons:
 
 before_install:
   # install haskell
-  #- curl -sSL https://get.haskellstack.org/ | sh
-  #- stack upgrade
-  #- stack --version
+  - curl -sSL https://get.haskellstack.org/ | sh
+  - stack upgrade
+  - stack --version
   # install rust
   - curl https://sh.rustup.rs -sSf | sh -s -- -y -v
   # required when sudo: required for the Ruby petstore tests
diff --git a/pom.xml b/pom.xml
index 9d0be2299873..a90ad2bb31be 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1023,7 +1023,7 @@
                 <!--<module>samples/client/petstore/dart-jaguar/openapi</module>
                 <module>samples/client/petstore/dart-jaguar/flutter_petstore/openapi</module>-->
                 <!--<module>samples/client/petstore/dart2/petstore</module>-->
-                <!--<module>samples/client/petstore/haskell-http-client</module>-->
+                <module>samples/client/petstore/haskell-http-client</module>
                 <module>samples/client/petstore/elm-0.18</module>
                 <module>samples/client/petstore/groovy</module>
                 <module>samples/client/petstore/rust</module>