diff --git a/nimbus/p2p/chain.nim b/nimbus/p2p/chain.nim
index 7aebc9c49..64335a763 100644
--- a/nimbus/p2p/chain.nim
+++ b/nimbus/p2p/chain.nim
@@ -18,7 +18,8 @@ type
     Constantinople,
     Petersburg,
     Istanbul,
-    MuirGlacier
+    MuirGlacier,
+    Berlin
 
   Chain* = ref object of AbstractChainDB
     db: BaseChainDB
diff --git a/nimbus/vm/interpreter/vm_forks.nim b/nimbus/vm/interpreter/vm_forks.nim
index b6204ec19..269e067a1 100644
--- a/nimbus/vm/interpreter/vm_forks.nim
+++ b/nimbus/vm/interpreter/vm_forks.nim
@@ -17,3 +17,4 @@ type
     FkConstantinople = "constantinople"
     FkPetersburg = "petersburg"
     FkIstanbul = "istanbul"
+    FkBerlin = "berlin"