diff --git a/.github/workflows/cmake-lx.yml b/.github/workflows/cmake-lx.yml
index 62298dce..9849e0ee 100644
--- a/.github/workflows/cmake-lx.yml
+++ b/.github/workflows/cmake-lx.yml
@@ -13,7 +13,7 @@ jobs:
     # cross-platform coverage.
     # See: https://docs.github.com/en/actions/configuring-and-managing-workflows/configuring-a-workflow#configuring-a-build-matrix
     name: CMake, Ubuntu
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
 
     steps:
     - uses: actions/checkout@v2
@@ -78,4 +78,4 @@ jobs:
         tar cvfz vgmstream-audacious.tar.gz vgmstream.so
         cd ..
         aws s3 cp cli/vgmstream-cli.tar.gz s3://vgmstream-builds/${{github.sha}}/linux/vgmstream-cli.tar.gz --acl public-read 
-        aws s3 cp audacious/vgmstream-audacious.tar.gz s3://vgmstream-builds/${{github.sha}}/linux/vgmstream-audacious.tar.gz --acl public-read
\ No newline at end of file
+        aws s3 cp audacious/vgmstream-audacious.tar.gz s3://vgmstream-builds/${{github.sha}}/linux/vgmstream-audacious.tar.gz --acl public-read