diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4d5366fe..960df751 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -17,7 +17,7 @@ jobs:
 
     - name: Build and run
       run: |
-        cmake -DNO_STL=0 ./
+        cmake ./
         MSBuild etl.sln
 
   build-visual-studio-no-stl:
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 253740f0..a0bebd0e 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -3,7 +3,7 @@ project(etl_unit_tests)
 
 add_definitions(-DETL_DEBUG)
 
-if (NO_STL EQUAL 1)
+if (${NO_STL})
 	message(STATUS "Compiling for No STL")
 	add_definitions(-DETL_NO_STL)
 endif()