diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 3ca9d2bc..e71b5e26 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -30,5 +30,5 @@ jobs:
 
     - name: Build and run
       run: |
-        cmake -DETL_NO_STL ./
+        cmake -DETL_NO_STL=1 ./
         MSBuild etl.sln