diff --git a/testing/node-driver/src/main/kotlin/net/corda/testing/node/internal/network/NetworkMapServer.kt b/testing/node-driver/src/main/kotlin/net/corda/testing/node/internal/network/NetworkMapServer.kt
index cafa5dda6d..ddad836326 100644
--- a/testing/node-driver/src/main/kotlin/net/corda/testing/node/internal/network/NetworkMapServer.kt
+++ b/testing/node-driver/src/main/kotlin/net/corda/testing/node/internal/network/NetworkMapServer.kt
@@ -2,7 +2,6 @@ package net.corda.testing.node.internal.network
 
 import net.corda.core.crypto.SecureHash
 import net.corda.core.crypto.SignedData
-import net.corda.core.internal.signWithCert
 import net.corda.core.node.NodeInfo
 import net.corda.core.serialization.deserialize
 import net.corda.core.serialization.serialize