diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 2a59e78..5e34367 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -70,7 +70,7 @@ jobs:
 
   build:
     name: Run Tests
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     if: >
       github.event_name == 'pull_request' ||
       ( contains(github.ref, 'main') && !contains(github.event.head_commit.message, '[no-ci]') ) ||
@@ -86,7 +86,7 @@ jobs:
           - '35'
           - '36'
         session:
-          #- 'gnome-xsession' Disabled for now as it miraculously fails on GitHub. Locally, all tests pass...
+          - 'gnome-xsession'
           - 'gnome-wayland-nested'
     steps:
     - uses: actions/checkout@v2
diff --git a/src/Doom.js b/src/Doom.js
index 9947564..61a9209 100644
--- a/src/Doom.js
+++ b/src/Doom.js
@@ -58,8 +58,8 @@ var Doom = class {
         // clang-format off
         shader.set_uniform_float(shader._uActorScale,      1, [testMode ? 1.0 : actorScale]);
         shader.set_uniform_float(shader._uHorizontalScale, 1, [settings.get_double('doom-horizontal-scale')]);
-        shader.set_uniform_float(shader._uVerticalScale,   1, [settings.get_double('doom-vertical-scale')]);
-        shader.set_uniform_float(shader._uPixelSize,       1, [settings.get_double('doom-pixel-size')]);
+        shader.set_uniform_float(shader._uVerticalScale,   1, [testMode ? 500.0 : settings.get_double('doom-vertical-scale')]);
+        shader.set_uniform_float(shader._uPixelSize,       1, [settings.get_int('doom-pixel-size')]);
         // clang-format on
       });
     });