diff --git a/app/terraform/proxy/fastly.py b/app/terraform/proxy/fastly.py
index 0fbb503..f00e506 100644
--- a/app/terraform/proxy/fastly.py
+++ b/app/terraform/proxy/fastly.py
@@ -11,7 +11,7 @@ class ProxyFastlyAutomation(ProxyAutomation):
     short_name = "proxy_fastly"
     description = "Deploy proxies to Fastly"
     provider = "fastly"
-    subgroup_max = max(current_app.config.get("FASTLY_MAX_BACKENDS", 5), 20)
+    subgroup_max = min(current_app.config.get("FASTLY_MAX_BACKENDS", 5), 20)
 
     template_parameters = [
         "aws_access_key",