diff --git a/kubernetes/appset.yaml b/kubernetes/appset.yaml
index 481f5c41b..4e1bfd1f6 100644
--- a/kubernetes/appset.yaml
+++ b/kubernetes/appset.yaml
@@ -24,23 +24,23 @@ spec:
   goTemplate: true
   template:
     metadata:
-      name: pp-{{ (printf "%.25s" .branch) | replace "_" "-" | replace "/" "-" | trimSuffix "-" | lower }}-{{.number}}
+      name: pp-{{ (printf "%.25s" .branch) | replace "_" "-" | replace "/" "-" | replace "." "-" | trimSuffix "-" | lower }}-{{.number}}
     spec:
       destination:
-        namespace: prev-{{ (printf "%.25s" .branch) | replace "_" "-" | replace "/" "-" | trimSuffix "-" | lower  }}
+        namespace: prev-{{ (printf "%.25s" .branch) | replace "_" "-" | replace "/" "-" | replace "." "-" | trimSuffix "-" | lower  }}
         server: https://kubernetes.default.svc
       project: default
       source:
         helm:
           parameters:
             - name: shortbranch
-              value: '{{ (printf "%.25s" .branch) | replace "_" "-" | replace "/" "-" | trimSuffix "-" | lower  }}'
+              value: '{{ (printf "%.25s" .branch) | replace "_" "-" | replace "/" "-" | replace "." "-"  | trimSuffix "-" | lower  }}'
             - name: sha
               value: '{{.head_short_sha_7}}'
             - name: branch
               value: '{{.branch}}'
             - name: host
-              value: '{{ (printf "%.25s" .branch) | replace "_" "-" | replace "/" "-" | trimSuffix "-" | lower  }}.loculus.org'
+              value: '{{ (printf "%.25s" .branch) | replace "_" "-" | replace "/" "-" | replace "." "-"  | trimSuffix "-" | lower  }}.loculus.org'
           valueFiles:
             - values.yaml
             - values_preview_server.yaml