diff --git a/nimbus/vm/state.nim b/nimbus/vm/state.nim
index eb9fd92a2..e422a183c 100644
--- a/nimbus/vm/state.nim
+++ b/nimbus/vm/state.nim
@@ -23,6 +23,8 @@ import
   ./types,
   eth/[common, keys]
 
+# Forward declaration
+proc consensusEnginePoA*(vmState: BaseVMState): bool
 
 proc getMinerAddress(vmState: BaseVMState): EthAddress =
   if not vmState.consensusEnginePoA:
diff --git a/nimbus/vm2/state.nim b/nimbus/vm2/state.nim
index 9c2e3630f..776a33234 100644
--- a/nimbus/vm2/state.nim
+++ b/nimbus/vm2/state.nim
@@ -22,6 +22,8 @@ import
   ./types,
   eth/[common, keys]
 
+# Forward declaration
+proc consensusEnginePoA*(vmState: BaseVMState): bool
 
 proc getMinerAddress(vmState: BaseVMState): EthAddress =
   if not vmState.consensusEnginePoA: