diff --git a/test/test-network/conf/24-search-domain.network b/test/test-network/conf/24-search-domain.network
index 970b130ab0..124af438a3 100644
--- a/test/test-network/conf/24-search-domain.network
+++ b/test/test-network/conf/24-search-domain.network
@@ -2,6 +2,6 @@
 Name=dummy98
 
 [Network]
-Address=192.168.42.100
+Address=192.168.42.100/24
 DNS=192.168.42.1
 Domains= one two three four five six seven eight nine ten
diff --git a/test/test-network/conf/dhcp-server-veth-peer.network b/test/test-network/conf/dhcp-server-veth-peer.network
index 7b38e72b7e..33d8be3964 100644
--- a/test/test-network/conf/dhcp-server-veth-peer.network
+++ b/test/test-network/conf/dhcp-server-veth-peer.network
@@ -2,5 +2,5 @@
 Name=veth-peer
 
 [Network]
-Address=2600::1
+Address=2600::1/0
 Address=192.168.5.1/24
diff --git a/test/test-network/conf/dhcp-v4-server-veth-peer.network b/test/test-network/conf/dhcp-v4-server-veth-peer.network
index 5c91d65432..3dfc5290ad 100644
--- a/test/test-network/conf/dhcp-v4-server-veth-peer.network
+++ b/test/test-network/conf/dhcp-v4-server-veth-peer.network
@@ -2,5 +2,5 @@
 Name=veth-peer
 
 [Network]
-Address=192.168.0.1
-Address=192.168.5.1
+Address=192.168.0.1/24
+Address=192.168.5.1/24