diff --git a/vppcfg/config/bridgedomain.py b/vppcfg/config/bridgedomain.py
index e7b5531..78ad861 100644
--- a/vppcfg/config/bridgedomain.py
+++ b/vppcfg/config/bridgedomain.py
@@ -136,7 +136,7 @@ def validate_bridgedomains(yaml):
         if instance == 0:
             msgs.append(f"bridgedomain {ifname} is reserved")
             result = False
-        elif instance > 16777215:
+        elif instance > 65535:
             msgs.append(
                 f"bridgedomain {ifname} has instance {int(instance)} which is too large"
             )
diff --git a/vppcfg/unittest/yaml/error-bridgedomain9.yaml b/vppcfg/unittest/yaml/error-bridgedomain9.yaml
index 683bd5e..db66a7c 100644
--- a/vppcfg/unittest/yaml/error-bridgedomain9.yaml
+++ b/vppcfg/unittest/yaml/error-bridgedomain9.yaml
@@ -9,7 +9,7 @@ test:
 bridgedomains:
   bd0:
     description: "Reserved in VPP"
-  bd16777215:
+  bd65535:
     description: "Cool."
-  bd16777216:
+  bd65536:
     description: "Not cool."