diff --git a/upup/models/cloudup/resources/addons/karpenter.sh/k8s-1.19.yaml.template b/upup/models/cloudup/resources/addons/karpenter.sh/k8s-1.19.yaml.template
index d4e29b66ca..6dfb007f5a 100644
--- a/upup/models/cloudup/resources/addons/karpenter.sh/k8s-1.19.yaml.template
+++ b/upup/models/cloudup/resources/addons/karpenter.sh/k8s-1.19.yaml.template
@@ -635,7 +635,7 @@ spec:
       values: ["spot"]
     - key: kubernetes.io/arch
       operator: In
-      values: ["{{ SupportedArchitecture $spec.Image }}"]
+      values: ["{{ ArchitectureOfAMI $spec.Image }}"]
     - key: "node.kubernetes.io/instance-type"
       operator: In
       values:
diff --git a/upup/pkg/fi/cloudup/template_functions.go b/upup/pkg/fi/cloudup/template_functions.go
index add1d3d7f8..b26d0e3c8d 100644
--- a/upup/pkg/fi/cloudup/template_functions.go
+++ b/upup/pkg/fi/cloudup/template_functions.go
@@ -281,7 +281,7 @@ func (tf *TemplateFunctions) AddTo(dest template.FuncMap, secretStore fi.SecretS
 		dest["EnableSQSTerminationDraining"] = func() bool { return *cluster.Spec.NodeTerminationHandler.EnableSQSTerminationDraining }
 	}
 
-	dest["SupportedArchitecture"] = tf.SupportedArchitecture
+	dest["ArchitectureOfAMI"] = tf.architectureOfAMI
 
 	dest["ParseTaint"] = parseTaint
 
@@ -741,7 +741,7 @@ func (tf *TemplateFunctions) GetNodeInstanceGroups() map[string]kops.InstanceGro
 	return nodegroups
 }
 
-func (tf *TemplateFunctions) SupportedArchitecture(amiID string) string {
+func (tf *TemplateFunctions) architectureOfAMI(amiID string) string {
 	image, _ := tf.cloud.(awsup.AWSCloud).ResolveImage(amiID)
 	switch *image.Architecture {
 	case "x86_64":