diff --git a/.github/workflows/codecov.yml b/.github/workflows/codecov.yml
index f1b9163..b317089 100644
--- a/.github/workflows/codecov.yml
+++ b/.github/workflows/codecov.yml
@@ -43,7 +43,7 @@ jobs:
 
       - name: Install dependencies with composer
         env:
-          COMPOSER_DEV_MODE=1
+          COMPOSER_DEV_MODE: 1
         run: composer install --prefer-dist --no-interaction --no-progress --optimize-autoloader --ansi
 
       - name: Collect code coverage with PHPUnit