diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index b96bb1ce..992e7d68 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -35,11 +35,11 @@ jobs:
         run: sudo /etc/init.d/postgresql start
 
       - name: Allow root to create PostgreSQL databases
-        run: su - postgres -c "createuser --createdb root"
+        run: sudo su - postgres -c "createuser --createdb root"
 
       - name: Create PostGIS extension
         run: >
-          su - postgres
+          sudo su - postgres
           -c "psql template1 -c 'create extension postgis'"
 
       - name: Install Tox and tox-gh-actions