diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d36ff49d4..fa59c5f2e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -125,7 +125,7 @@ jobs:
       run: tar xjf test-${{ matrix.compiler }}.tar.bz2 -C ${{ env.DF_FOLDER }}
     - name: Start X server
       if: matrix.os == 'ubuntu'
-      run: Xvfb :0 -screen 0 1600x1200x32 &
+      run: Xvfb :0 -screen 0 1600x1200x24 &
     - name: Run lua tests
       timeout-minutes: 10
       env:
diff --git a/ci/test.lua b/ci/test.lua
index 34fcd97a6..193b89ce8 100644
--- a/ci/test.lua
+++ b/ci/test.lua
@@ -213,7 +213,7 @@ end
 
 local function click_top_title_button(scr)
     local sw, sh = dfhack.screen.getWindowSize()
-    print(('screen dimensions: %d, %d'):format(sw. sh))
+    print(('screen dimensions: %d, %d'):format(sw, sh))
     df.global.gps.mouse_x = sw // 2
     df.global.gps.precise_mouse_x = df.global.gps.mouse_x * df.global.gps.tile_pixel_x
     if sh < 60 then