diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 46ce4ad..a04b503 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -329,8 +329,8 @@ jobs:
       - name: Unzip SDL2
         run: tar -xf SDL2.zip -C ${{ runner.temp }}\SDL2 --strip-components=1
 
-      - name: Set SDL_DIR environment variable
-        run: echo SDL_DIR=${{ runner.temp }}\SDL2\cmake >> $GITHUB_ENV
+      - name: Set SDL2_DIR environment variable
+        run: echo SDL2_DIR=${{ runner.temp }}\SDL2\cmake >> $GITHUB_ENV
 
       - name: Setup Python
         uses: actions/setup-python@v2.2.2