diff --git a/zkevm-circuits/src/evm_circuit/util/constraint_builder.rs b/zkevm-circuits/src/evm_circuit/util/constraint_builder.rs
index 32943e5cd3..8678e0836a 100644
--- a/zkevm-circuits/src/evm_circuit/util/constraint_builder.rs
+++ b/zkevm-circuits/src/evm_circuit/util/constraint_builder.rs
@@ -1043,7 +1043,7 @@ impl<'a, F: FieldExt> ConstraintBuilder<'a, F> {
         &mut self,
         tx_id: Expression<F>,
         log_id: Expression<F>,
-        tag: TxLogFieldTag,
+        field_tag: TxLogFieldTag,
         index: Expression<F>,
         value: Expression<F>,
     ) {
@@ -1053,8 +1053,8 @@ impl<'a, F: FieldExt> ConstraintBuilder<'a, F> {
             RwTableTag::TxLog,
             [
                 tx_id,
-                index + (1u64 << 8).expr() * log_id,
-                tag.expr(),
+                index + (1u64 << 16).expr() * field_tag.expr() + (1u64 << 32).expr() * log_id,
+                field_tag.expr(),
                 0.expr(),
                 value,
                 0.expr(),
diff --git a/zkevm-circuits/src/evm_circuit/witness.rs b/zkevm-circuits/src/evm_circuit/witness.rs
index b706222de1..bfa12dc9a0 100644
--- a/zkevm-circuits/src/evm_circuit/witness.rs
+++ b/zkevm-circuits/src/evm_circuit/witness.rs
@@ -760,8 +760,19 @@ impl Rw {
             Self::Stack { stack_pointer, .. } => {
                 Some(U256::from(*stack_pointer as u64).to_address())
             }
-            Self::TxLog { log_id, index, .. } => {
-                Some((U256::from(*index as u64) + (U256::from(*log_id) << 8)).to_address())
+            Self::TxLog {
+                log_id,
+                index,
+                field_tag,
+                ..
+            } => {
+                // make field_tag fit into one limb (16 bits)
+                Some(
+                    (U256::from(*index as u64)
+                        + (U256::from(*field_tag as u64) << 16)
+                        + (U256::from(*log_id) << 32))
+                        .to_address(),
+                )
             }
             Self::Start
             | Self::CallContext { .. }