diff --git a/.github/workflows/ci_workflow.yml b/.github/workflows/ci_workflow.yml
index 4602e8c3e..4813c7f2c 100644
--- a/.github/workflows/ci_workflow.yml
+++ b/.github/workflows/ci_workflow.yml
@@ -79,7 +79,7 @@ jobs:
       OPENEXR_FORCE_INTERNAL_DEFLATE: ${{ matrix.OPENEXR_FORCE_INTERNAL_DEFLATE || 'OFF' }}
       BUILD_TESTING: ${{ matrix.BUILD_TESTING || 'ON' }}
       namespace: ${{ matrix.namespace }}
-      validate_install: ${{ matrix.validate_install || 'ON' }
+      validate_install: ${{ matrix.validate_install || 'ON' }}
     strategy:
       matrix:
         include: