diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 95490cfa..7d1bf608 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,8 +11,8 @@ on:
         
 jobs:
 
-  # We run most of our testing on linux but it should apply to mac too;
-  # we can always add an explicit mac job if it seems worthwhile.
+  # We run most of our testing only on linux but it should apply to mac too;
+  # we can always add an explicit mac job later if it seems worthwhile.
   ci_unix:
     runs-on: ubuntu-20.04
     steps:
@@ -25,10 +25,12 @@ jobs:
       run: tools/pcommand install_pip_reqs
     - name: Run checks and tests
       run: make -j2 check test
+    - name: Prefab server build
+      run: make prefab-server-debug-build
 
   # Most of our toolset doesn't work on raw windows (outside of WSL).
   # However, it's nice to at least run unit tests there since some behavior
-  # (filesystem, etc) can vary significantly.
+  # (filesystem, etc) can vary significantly between windows and linux/apple.
   ci_windows:
     runs-on: windows-latest
     steps: