diff --git a/arbos/programs/api.go b/arbos/programs/api.go
index ed43751a54..0519cd9f01 100644
--- a/arbos/programs/api.go
+++ b/arbos/programs/api.go
@@ -144,17 +144,19 @@ func newApiClosures(
 
 		// Tracing: emit the call (value transfer is done later in evm.Call)
 		if tracingInfo != nil {
+			var args []uint256.Int
+			args = append(args, *uint256.NewInt(gas))                          // gas
+			args = append(args, *uint256.NewInt(0).SetBytes(contract.Bytes())) // to address
+			if opcode == vm.CALL {
+				args = append(args, *uint256.NewInt(0).SetBytes(value.Bytes())) // call value
+			}
+			args = append(args, *uint256.NewInt(0))                  // memory offset
+			args = append(args, *uint256.NewInt(uint64(len(input)))) // memory length
+			args = append(args, *uint256.NewInt(0))                  // return offset
+			args = append(args, *uint256.NewInt(0))                  // return size
 			s := &vm.ScopeContext{
-				Memory: vm.NewMemory(),
-				Stack: util.TracingStackFromArgs(
-					*uint256.NewInt(gas),                          // gas
-					*uint256.NewInt(0).SetBytes(contract.Bytes()), // to address
-					*uint256.NewInt(0).SetBytes(value.Bytes()),    // call value
-					*uint256.NewInt(0),                            // memory offset
-					*uint256.NewInt(uint64(len(input))),           // memory length
-					*uint256.NewInt(0),                            // return offset
-					*uint256.NewInt(0),                            // return size
-				),
+				Memory:   util.TracingMemoryFromBytes(input),
+				Stack:    util.TracingStackFromArgs(args...),
 				Contract: scope.Contract,
 			}
 			tracingInfo.Tracer.CaptureState(0, opcode, startGas, baseCost+gas, s, []byte{}, depth, nil)
diff --git a/arbos/util/tracing.go b/arbos/util/tracing.go
index f0f101bc20..f3564143c5 100644
--- a/arbos/util/tracing.go
+++ b/arbos/util/tracing.go
@@ -56,11 +56,8 @@ func (info *TracingInfo) RecordEmitLog(topics []common.Hash, data []byte) {
 	for _, topic := range topics {
 		args = append(args, HashToUint256(topic)) // topic: 32-byte value. Max topics count is 4
 	}
-	memory := vm.NewMemory()
-	memory.Resize(size)
-	memory.Set(0, size, data)
 	scope := &vm.ScopeContext{
-		Memory:   memory,
+		Memory:   TracingMemoryFromBytes(data),
 		Stack:    TracingStackFromArgs(args...),
 		Contract: info.Contract,
 	}