diff --git a/clients/common/nm-client-utils.c b/clients/common/nm-client-utils.c
index bf4dcc77f3..8a28db2dd5 100644
--- a/clients/common/nm-client-utils.c
+++ b/clients/common/nm-client-utils.c
@@ -399,9 +399,11 @@ nmc_device_reason_to_string (NMDeviceStateReason reason)
 		return _("The device's parent changed");
 	case NM_DEVICE_STATE_REASON_PARENT_MANAGED_CHANGED:
 		return _("The device parent's management changed");
-
 	case NM_DEVICE_STATE_REASON_OVSDB_FAILED:
 		return _("OpenVSwitch database connection failed");
+	case NM_DEVICE_STATE_REASON_IP_ADDRESS_DUPLICATE:
+		return _("A duplicate IP address was detected");
+
 	}
 
 	/* TRANSLATORS: Unknown reason for a device state change (NMDeviceStateReason) */
diff --git a/libnm-core/nm-dbus-interface.h b/libnm-core/nm-dbus-interface.h
index 98c94154c9..a787cd0ecd 100644
--- a/libnm-core/nm-dbus-interface.h
+++ b/libnm-core/nm-dbus-interface.h
@@ -551,6 +551,7 @@ typedef enum {
  * @NM_DEVICE_STATE_REASON_PARENT_CHANGED: the device's parent changed
  * @NM_DEVICE_STATE_REASON_PARENT_MANAGED_CHANGED: the device parent's management changed
  * @NM_DEVICE_STATE_REASON_OVSDB_FAILED: problem communicating with OpenVSwitch database
+ * @NM_DEVICE_STATE_REASON_IP_ADDRESS_DUPLICATE: a duplicate IP address was detected
  *
  * Device state change reason codes
  */
@@ -619,6 +620,7 @@ typedef enum {
 	NM_DEVICE_STATE_REASON_PARENT_CHANGED                 = 61,
 	NM_DEVICE_STATE_REASON_PARENT_MANAGED_CHANGED         = 62,
 	NM_DEVICE_STATE_REASON_OVSDB_FAILED                   = 63,
+	NM_DEVICE_STATE_REASON_IP_ADDRESS_DUPLICATE           = 64,
 } NMDeviceStateReason;
 
 /**
diff --git a/src/devices/nm-device.c b/src/devices/nm-device.c
index f9b2217f9a..561c3643c4 100644
--- a/src/devices/nm-device.c
+++ b/src/devices/nm-device.c
@@ -650,6 +650,7 @@ NM_UTILS_LOOKUP_STR_DEFINE (nm_device_state_reason_to_str, NMDeviceStateReason,
 	NM_UTILS_LOOKUP_STR_ITEM (NM_DEVICE_STATE_REASON_PARENT_CHANGED,                 "parent-changed"),
 	NM_UTILS_LOOKUP_STR_ITEM (NM_DEVICE_STATE_REASON_PARENT_MANAGED_CHANGED,         "parent-managed-changed"),
 	NM_UTILS_LOOKUP_STR_ITEM (NM_DEVICE_STATE_REASON_OVSDB_FAILED,                   "ovsdb-failed"),
+	NM_UTILS_LOOKUP_STR_ITEM (NM_DEVICE_STATE_REASON_IP_ADDRESS_DUPLICATE,           "ip-address-duplicate"),
 );
 
 #define reason_to_string(reason) \
@@ -5493,7 +5494,7 @@ ipv4_manual_method_apply (NMDevice *self, NMIP4Config **configs, gboolean succes
 		g_object_unref (empty);
 	} else {
 		nm_device_ip_method_failed (self, AF_INET,
-		                            NM_DEVICE_STATE_REASON_IP_CONFIG_UNAVAILABLE);
+		                            NM_DEVICE_STATE_REASON_IP_ADDRESS_DUPLICATE);
 	}
 }
 
@@ -6077,7 +6078,7 @@ dhcp4_dad_cb (NMDevice *self, NMIP4Config **configs, gboolean success)
 		nm_device_activate_schedule_ip4_config_result (self, configs[1]);
 	else {
 		nm_device_ip_method_failed (self, AF_INET,
-		                            NM_DEVICE_STATE_REASON_IP_CONFIG_UNAVAILABLE);
+		                            NM_DEVICE_STATE_REASON_IP_ADDRESS_DUPLICATE);
 	}
 }