diff --git a/execution/tracing/tracers/logger/json_stream.go b/execution/tracing/tracers/logger/json_stream.go
index 93cbf4061a4..272bdd6ca77 100644
--- a/execution/tracing/tracers/logger/json_stream.go
+++ b/execution/tracing/tracers/logger/json_stream.go
@@ -214,8 +214,8 @@ func (l *JsonStreamLogger) OnOpcode(pc uint64, typ byte, gas, cost uint64, scope
 			} else {
 				l.stream.WriteMore()
 			}
-			l.stream.WriteObjectField(string(l.hexEncodeBuf[0:hex.Encode(l.hexEncodeBuf[:], loc[:])]))
-			l.stream.WriteString(string(l.hexEncodeBuf[0:hex.Encode(l.hexEncodeBuf[:], value[:])]))
+			l.stream.WriteObjectField(loc.Hex())
+			l.stream.WriteString(value.Hex())
 		}
 		l.stream.WriteObjectEnd()
 	}
diff --git a/execution/tracing/tracers/logger/logger.go b/execution/tracing/tracers/logger/logger.go
index 894bb545e53..bbbc0b5bb37 100644
--- a/execution/tracing/tracers/logger/logger.go
+++ b/execution/tracing/tracers/logger/logger.go
@@ -322,7 +322,7 @@ func FormatLogs(logs []StructLog) []StructLogRes {
 		if trace.Storage != nil {
 			storage := make(map[string]string)
 			for i, storageValue := range trace.Storage {
-				storage[fmt.Sprintf("%x", i)] = fmt.Sprintf("%x", storageValue)
+				storage[i.Hex()] = storageValue.Hex()
 			}
 			formatted[index].Storage = &storage
 		}
diff --git a/rpc/ethapi/api.go b/rpc/ethapi/api.go
index bfc5ca54727..670297cc9f3 100644
--- a/rpc/ethapi/api.go
+++ b/rpc/ethapi/api.go
@@ -415,7 +415,7 @@ func FormatLogs(logs []logger.StructLog) []StructLogRes {
 		if trace.Storage != nil {
 			storage := make(map[string]string)
 			for i, storageValue := range trace.Storage {
-				storage[fmt.Sprintf("%x", i)] = fmt.Sprintf("%x", storageValue)
+				storage[i.Hex()] = storageValue.Hex()
 			}
 			formatted[index].Storage = &storage
 		}