diff --git a/example.yaml b/example.yaml
index 8c74511..5182fc3 100644
--- a/example.yaml
+++ b/example.yaml
@@ -54,7 +54,7 @@ loopbacks:
     description: "Core: example.ipng.ch"
     mtu: 9216
     lcp: "loop0"
-    addresses: [ 192.0.2.1/32, 2001:db8:1::1/128 ]
+    addresses: [ 192.0.2.1/32, 192.0.2.2/24, 2001:db8:1::1/128 ]
 
 bridgedomains:
   bd10:
diff --git a/unittest/error-address1.yaml b/unittest/error-address1.yaml
index b7538a5..56918c6 100644
--- a/unittest/error-address1.yaml
+++ b/unittest/error-address1.yaml
@@ -2,10 +2,10 @@ test:
   description: "IP interfaces cannot be more- or less-specific of any other interface"
   errors:
     expected:
-      - "interface .* IP address .* is not allowed"
-      - "sub-interface .* IP address .* is not allowed"
-      - "loopback .* IP address .* is not allowed"
-      - "bridgedomain .* IP address .* is not allowed"
+      - "interface .* IP address .* conflicts with another"
+      - "sub-interface .* IP address .* conflicts with another"
+      - "loopback .* IP address .* conflicts with another"
+      - "bridgedomain .* IP address .* conflicts with another"
     count: 18
 ---
 interfaces:
diff --git a/validator/bridgedomain.py b/validator/bridgedomain.py
index 6d24196..47ddd80 100644
--- a/validator/bridgedomain.py
+++ b/validator/bridgedomain.py
@@ -56,7 +56,7 @@ def validate_bridgedomains(yaml):
         if 'addresses' in iface:
             for a in iface['addresses']:
                 if not address.is_allowed(yaml, ifname, iface['addresses'], a):
-                    msgs.append("bridgedomain %s IP address %s is not allowed" % (ifname, a))
+                    msgs.append("bridgedomain %s IP address %s conflicts with another" % (ifname, a))
                     result = False
 
         if 'interfaces' in iface:
diff --git a/validator/interface.py b/validator/interface.py
index 2827c46..756dc3c 100644
--- a/validator/interface.py
+++ b/validator/interface.py
@@ -287,7 +287,7 @@ def validate_interfaces(yaml):
         if 'addresses' in iface:
             for a in iface['addresses']:
                 if not address.is_allowed(yaml, ifname, iface['addresses'], a):
-                    msgs.append("interface %s IP address %s is not allowed" % (ifname, a))
+                    msgs.append("interface %s IP address %s conflicts with another" % (ifname, a))
                     result = False
 
         if has_sub(yaml, ifname):
@@ -321,7 +321,7 @@ def validate_interfaces(yaml):
                         result = False
                     for a in sub_iface['addresses']:
                         if not address.is_allowed(yaml, sub_ifname, sub_iface['addresses'], a):
-                            msgs.append("sub-interface %s IP address %s is not allowed" % (sub_ifname, a))
+                            msgs.append("sub-interface %s IP address %s conflicts with another" % (sub_ifname, a))
                             result = False
                 if not valid_encapsulation(yaml, sub_ifname):
                     msgs.append("sub-interface %s has invalid encapsulation" % (sub_ifname))
diff --git a/validator/loopback.py b/validator/loopback.py
index fbfe285..978edf5 100644
--- a/validator/loopback.py
+++ b/validator/loopback.py
@@ -50,7 +50,7 @@ def validate_loopbacks(yaml):
         if 'addresses' in iface:
             for a in iface['addresses']:
                 if not address.is_allowed(yaml, ifname, iface['addresses'], a):
-                    msgs.append("loopback %s IP address %s is not allowed" % (ifname, a))
+                    msgs.append("loopback %s IP address %s conflicts with another" % (ifname, a))
                     result = False
 
     return result, msgs