diff --git a/nimbus/vm/computation.nim b/nimbus/vm/computation.nim
index 7455cee74..989981ddf 100644
--- a/nimbus/vm/computation.nim
+++ b/nimbus/vm/computation.nim
@@ -11,7 +11,7 @@ import
   ../constants, ../errors, ../vm_state, ../vm_types,
   ./interpreter/[opcode_values, gas_meter, gas_costs, vm_forks],
   ./code_stream, ./memory, ./message, ./stack, ../db/[state_db, db_chain],
-  ../utils/header, stew/[byteutils, ranges], precompiles,
+  ../utils/header, stew/[byteutils, ranges, ranges/ptr_arith], precompiles,
   transaction_tracer, ../utils
 
 when defined(evmc_enabled):
diff --git a/nimbus/vm/evmc_host.nim b/nimbus/vm/evmc_host.nim
index 6686dbd22..ae1298535 100644
--- a/nimbus/vm/evmc_host.nim
+++ b/nimbus/vm/evmc_host.nim
@@ -116,7 +116,7 @@ proc hostEmitLogImpl(ctx: Computation, address: EthAddress,
     for i in 0 ..< topicsCount:
       log.topics[i] = topics[i].bytes
 
-  log.data = @makeOpenArray(data, dataSize)
+  log.data = @(makeOpenArray(data, dataSize))
   log.address = address
   ctx.addLogEntry(log)
 
@@ -128,7 +128,7 @@ template createImpl(c: Computation, m: nimbus_message, res: nimbus_result) =
     gas: m.gas,
     sender: m.sender,
     value: Uint256.fromEvmc(m.value),
-    data: @makeOpenArray(m.inputData, m.inputSize.int)
+    data: @(makeOpenArray(m.inputData, m.inputSize.int))
     )
 
   let child = newComputation(c.vmState, childMsg, Uint256.fromEvmc(m.create2_salt))
@@ -159,7 +159,7 @@ template callImpl(c: Computation, m: nimbus_message, res: nimbus_result) =
     codeAddress: m.destination,
     contractAddress: if m.kind == EVMC_CALL: m.destination else: c.msg.contractAddress,
     value: Uint256.fromEvmc(m.value),
-    data: @makeOpenArray(m.inputData, m.inputSize.int)
+    data: @(makeOpenArray(m.inputData, m.inputSize.int)),
     flags: MsgFlags(m.flags)
     )
 
diff --git a/nimbus/vm/interpreter/opcodes_impl.nim b/nimbus/vm/interpreter/opcodes_impl.nim
index 24aa99149..8abf0cdfc 100644
--- a/nimbus/vm/interpreter/opcodes_impl.nim
+++ b/nimbus/vm/interpreter/opcodes_impl.nim
@@ -614,7 +614,7 @@ template genCreate(callName: untyped, opCode: Op): untyped =
       )
 
       var res = c.host.call(msg)
-      c.returnData = @makeOpenArray(res.outputData, res.outputSize.int)
+      c.returnData = @(makeOpenArray(res.outputData, res.outputSize.int))
       c.gasMeter.returnGas(res.gas_left)
 
       if res.status_code == EVMC_SUCCESS:
@@ -780,7 +780,7 @@ template genCall(callName: untyped, opCode: Op): untyped =
       )
 
       var res = c.host.call(msg)
-      c.returnData = @makeOpenArray(res.outputData, res.outputSize.int)
+      c.returnData = @(makeOpenArray(res.outputData, res.outputSize.int))
 
       let actualOutputSize = min(memOutLen, c.returnData.len)
       if actualOutputSize > 0: