diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f555e101..758af06c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -7,8 +7,8 @@ on:
     branches: [ master ]
 
 env:
-  OMP_NUM_THREADS=2
-  MKL_NUM_THREADS=2
+  OMP_NUM_THREADS: 2
+  MKL_NUM_THREADS: 2
 
 jobs:
   test: