diff --git a/.travis.yml b/.travis.yml
index a9220ff0..75e0acbb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,10 +9,10 @@ env:
 
 matrix:
   include:
-#    - env: PAGMO_PLUGINS_NONFREE_BUILD="manylinux64Py37" DOCKER_IMAGE="pagmo2/manylinux1_x86_64_with_deps"
-#      sudo: required
-#      services:
-#      - docker
+    - env: PAGMO_PLUGINS_NONFREE_BUILD="manylinux64Py37" DOCKER_IMAGE="pagmo2/manylinux1_x86_64_with_deps"
+      sudo: required
+      services:
+      - docker
 #    - env: PAGMO_PLUGINS_NONFREE_BUILD="manylinux64Py36" DOCKER_IMAGE="pagmo2/manylinux1_x86_64_with_deps"
 #      sudo: required
 #      services:
@@ -99,7 +99,7 @@ matrix:
     osx_image: xcode11
   - env: PAGMO_PLUGINS_NONFREE_BUILD="OSXPython27"
     os: osx
-    osx_image: xcode11 
+    osx_image: xcode11
 
 script:
 - mkdir build