diff --git a/datasette/publish/cloudrun.py b/datasette/publish/cloudrun.py
index 11a39fb2..50b2b2fd 100644
--- a/datasette/publish/cloudrun.py
+++ b/datasette/publish/cloudrun.py
@@ -43,6 +43,7 @@ def publish_subcommand(publish):
     )
     @click.option(
         "--timeout",
+        type=int,
         help="Build timeout in seconds",
     )
     @click.option(
diff --git a/docs/cli-reference.rst b/docs/cli-reference.rst
index 3ca48aa2..2a6fbfc8 100644
--- a/docs/cli-reference.rst
+++ b/docs/cli-reference.rst
@@ -248,7 +248,7 @@ datasette publish cloudrun --help
                                       metadata.json
       --memory TEXT                   Memory to allocate in Cloud Run, e.g. 1Gi
       --cpu [1|2|4]                   Number of vCPUs to allocate in Cloud Run
-      --timeout TEXT                  Build timeout in seconds
+      --timeout INTEGER               Build timeout in seconds
       --apt-get-install TEXT          Additional packages to apt-get install
       --help                          Show this message and exit.