diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 33f821f..4278435 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -82,7 +82,7 @@ jobs:
       fail-fast: false
     env:
       CC: ${{ matrix.compiler }}
-      CFLAGs: ${{ matrix.cflags }}
+      CFLAGS: ${{ matrix.cflags }}
 
     steps:
       - name: Checkout