diff --git a/nimbus/p2p/executor.nim b/nimbus/p2p/executor.nim
index fafd21bc6..e1d0ab8c0 100644
--- a/nimbus/p2p/executor.nim
+++ b/nimbus/p2p/executor.nim
@@ -91,7 +91,7 @@ const
     eth2, # FkConstantinople
     eth2, # FkPetersburg
     eth2, # FkIstanbul
-    eth2  # FkGlacierMuir
+    eth2  # FkMuirGlacier
   ]
 
 proc processBlock*(chainDB: BaseChainDB, header: BlockHeader, body: BlockBody, vmState: BaseVMState): ValidationResult =
diff --git a/nimbus/utils/difficulty.nim b/nimbus/utils/difficulty.nim
index 887628378..0c2e01ed1 100644
--- a/nimbus/utils/difficulty.nim
+++ b/nimbus/utils/difficulty.nim
@@ -145,7 +145,7 @@ template calcDifficultyGlacierMuir*(timeStamp: EthTime, parent: BlockHeader): Di
 
 func calcDifficulty*(timeStamp: EthTime, parent: BlockHeader): DifficultyInt =
   let next = parent.blockNumber + bigOne
-  if next >= forkBlocks[FkGlacierMuir]:
+  if next >= forkBlocks[FkMuirGlacier]:
     result = calcDifficultyGlacierMuir(timeStamp, parent)
   elif next >= forkBlocks[FkConstantinople]:
     result = calcDifficultyConstantinople(timeStamp, parent)
@@ -158,7 +158,7 @@ func calcDifficulty*(timeStamp: EthTime, parent: BlockHeader): DifficultyInt =
 
 func calcDifficulty*(timeStamp: EthTime, parent: BlockHeader, fork: Fork): DifficultyInt =
   case fork
-  of FkGlacierMuir:
+  of FkMuirGlacier:
     result = calcDifficultyGlacierMuir(timeStamp, parent)
   of FkConstantinople..FkPetersburg:
     result = calcDifficultyConstantinople(timeStamp, parent)
diff --git a/nimbus/vm/interpreter/gas_costs.nim b/nimbus/vm/interpreter/gas_costs.nim
index f4f4864af..d57a38257 100644
--- a/nimbus/vm/interpreter/gas_costs.nim
+++ b/nimbus/vm/interpreter/gas_costs.nim
@@ -724,7 +724,7 @@ const
     FkConstantinople: SpuriousGasFees,
     FkPetersburg: SpuriousGasFees,
     FkIstanbul: IstanbulGasFees,
-    FkGlacierMuir: IstanbulGasFees
+    FkMuirGlacier: IstanbulGasFees
   ]
 
 
diff --git a/nimbus/vm/interpreter/vm_forks.nim b/nimbus/vm/interpreter/vm_forks.nim
index 4aaee54cb..236de1958 100644
--- a/nimbus/vm/interpreter/vm_forks.nim
+++ b/nimbus/vm/interpreter/vm_forks.nim
@@ -19,7 +19,7 @@ type
     FkConstantinople,
     FkPetersburg,
     FkIstanbul,
-    FkGlacierMuir
+    FkMuirGlacier
 
 const
   forkBlocks*: array[Fork, BlockNumber] = [
@@ -33,7 +33,7 @@ const
     FkConstantinople: 7_280_000.toBlockNumber, # Never Occured in MainNet
     FkPetersburg:     7_280_000.toBlockNumber, # 28/02/2019 07:52:04
     FkIstanbul:       9_069_000.toBlockNumber, # 08/12/2019 12:25:09
-    FkGlacierMuir:    9_200_000.toBlockNumber  # 02/01/2020 08:30:49
+    FkMuirGlacier:    9_200_000.toBlockNumber  # 02/01/2020 08:30:49
   ]
 
 proc toFork*(blockNumber: BlockNumber): Fork =
@@ -54,8 +54,8 @@ proc toFork*(blockNumber: BlockNumber): Fork =
   elif blockNumber < forkBlocks[FkByzantium]: FkSpurious
   elif blockNumber < forkBlocks[FkConstantinople]: FkByzantium
   elif blockNumber < forkBlocks[FkIstanbul]: FkPetersburg
-  elif blockNumber < forkBlocks[FkGlacierMuir]: FkIstanbul
-  else: FkGlacierMuir
+  elif blockNumber < forkBlocks[FkMuirGlacier]: FkIstanbul
+  else: FkMuirGlacier
 
 proc `$`*(fork: Fork): string =
   case fork
@@ -69,4 +69,4 @@ proc `$`*(fork: Fork): string =
   of FkConstantinople: result = "Constantinople"
   of FkPetersburg: result = "Petersburg"
   of FkIstanbul: result = "Istanbul"
-  of FkGlacierMuir: result = "Glacier Muir"
+  of FkMuirGlacier: result = "Glacier Muir"