diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3c9d90b..17e92f4 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -53,6 +53,10 @@ jobs:
 
       - name: Build catalog
         shell: bash
+        env:
+          # Silence a harmless polars warning when scanning geo files
+          # (geoarrow.wkb loaded as its storage type, which is what we want)
+          POLARS_UNKNOWN_EXTENSION_TYPE_BEHAVIOR: load_as_storage
         run: python -m datannurpy catalog.yml 2>&1 | tee build.log
 
       - name: Write job summary