diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 8938102..c18a9f3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -35,8 +35,8 @@ jobs:
         cd /opt/csv2bufr
         wget https://github.com/wmo-im/csv2bufr-templates/archive/refs/tags/v0.1.tar.gz
         tar -zxf v0.1.tar.gz --strip-components=1 csv2bufr-templates-0.1/templates
-        export BUFR_ORIGINATING_CENTRE 0
-        export BUFR_ORIGINATING_SUBCENTRE 0
+        export BUFR_ORIGINATING_CENTRE=0
+        export BUFR_ORIGINATING_SUBCENTRE=0
     - name: run tests ⚙️
       run: |
         pytest