diff --git a/.changeset/two-ties-sort.md b/.changeset/two-ties-sort.md
new file mode 100644
index 0000000000..e5292d7b0c
--- /dev/null
+++ b/.changeset/two-ties-sort.md
@@ -0,0 +1,5 @@
+---
+"viem": patch
+---
+
+Fixed an issue where `serializeTransaction` was incorrectly encoding zero-ish properties.
diff --git a/src/utils/transaction/serializeTransaction.test.ts b/src/utils/transaction/serializeTransaction.test.ts
index a1202e886c..0a1a49afac 100644
--- a/src/utils/transaction/serializeTransaction.test.ts
+++ b/src/utils/transaction/serializeTransaction.test.ts
@@ -41,6 +41,28 @@ describe('eip1559', () => {
     })
   })
 
+  test('default (all zeros)', () => {
+    const baseEip1559Zero = {
+      to: accounts[1].address,
+      nonce: 0,
+      chainId: 1,
+      maxFeePerGas: 0n,
+      maxPriorityFeePerGas: 0n,
+      value: 0n,
+    } satisfies TransactionSerializableEIP1559
+
+    const serialized = serializeTransaction(baseEip1559Zero)
+
+    expect(serialized).toEqual(
+      '0x02dd01808080809470997970c51812dc3a010c7d01b50e0d17dc79c88080c0',
+    )
+    expect(parseTransaction(serialized)).toEqual({
+      chainId: 1,
+      to: accounts[1].address,
+      type: 'eip1559',
+    })
+  })
+
   test('minimal (w/ maxFeePerGas)', () => {
     const args = {
       chainId: 1,
@@ -223,6 +245,29 @@ describe('eip2930', () => {
     })
   })
 
+  test('default (all zeros)', () => {
+    const baseEip2930Zero = {
+      to: accounts[1].address,
+      nonce: 0,
+      chainId: 1,
+      value: 0n,
+      gasPrice: 0n,
+      accessList: [],
+    } satisfies TransactionSerializableEIP2930
+
+    const serialized = serializeTransaction(baseEip2930Zero)
+
+    expect(serialized).toEqual(
+      '0x01dc018080809470997970c51812dc3a010c7d01b50e0d17dc79c88080c0',
+    )
+
+    expect(parseTransaction(serialized)).toEqual({
+      chainId: 1,
+      to: accounts[1].address,
+      type: 'eip2930',
+    })
+  })
+
   test('minimal (w/ accessList & gasPrice)', () => {
     const args = {
       chainId: 1,
@@ -384,6 +429,26 @@ describe('legacy', () => {
     })
   })
 
+  test('default (all zeros)', () => {
+    const baseLegacyZero = {
+      to: accounts[1].address,
+      nonce: 0,
+      value: 0n,
+      gasPrice: 0n,
+    } satisfies TransactionSerializableLegacy
+
+    const serialized = serializeTransaction(baseLegacyZero)
+
+    expect(serialized).toEqual(
+      '0xda8080809470997970c51812dc3a010c7d01b50e0d17dc79c88080',
+    )
+
+    expect(parseTransaction(serialized)).toEqual({
+      to: accounts[1].address,
+      type: 'legacy',
+    })
+  })
+
   test('minimal (w/ gasPrice)', () => {
     const args = {
       gasPrice: parseGwei('2'),
diff --git a/src/utils/transaction/serializeTransaction.ts b/src/utils/transaction/serializeTransaction.ts
index cc59c4adef..ee9b8393d4 100644
--- a/src/utils/transaction/serializeTransaction.ts
+++ b/src/utils/transaction/serializeTransaction.ts
@@ -82,14 +82,12 @@ function serializeTransactionEIP1559(
 
   const serializedTransaction = [
     toHex(chainId),
-    typeof nonce !== 'undefined' ? toHex(nonce) : '0x',
-    typeof maxPriorityFeePerGas !== 'undefined'
-      ? toHex(maxPriorityFeePerGas)
-      : '0x',
-    typeof maxFeePerGas !== 'undefined' ? toHex(maxFeePerGas) : '0x',
-    typeof gas !== 'undefined' ? toHex(gas) : '0x',
+    nonce ? toHex(nonce) : '0x',
+    maxPriorityFeePerGas ? toHex(maxPriorityFeePerGas) : '0x',
+    maxFeePerGas ? toHex(maxFeePerGas) : '0x',
+    gas ? toHex(gas) : '0x',
     to ?? '0x',
-    typeof value !== 'undefined' ? toHex(value) : '0x',
+    value ? toHex(value) : '0x',
     data ?? '0x',
     serializedAccessList,
   ]
@@ -120,11 +118,11 @@ function serializeTransactionEIP2930(
 
   const serializedTransaction = [
     toHex(chainId),
-    typeof nonce !== 'undefined' ? toHex(nonce) : '0x',
-    typeof gasPrice !== 'undefined' ? toHex(gasPrice) : '0x',
-    typeof gas !== 'undefined' ? toHex(gas) : '0x',
+    nonce ? toHex(nonce) : '0x',
+    gasPrice ? toHex(gasPrice) : '0x',
+    gas ? toHex(gas) : '0x',
     to ?? '0x',
-    typeof value !== 'undefined' ? toHex(value) : '0x',
+    value ? toHex(value) : '0x',
     data ?? '0x',
     serializedAccessList,
   ]
@@ -151,11 +149,11 @@ function serializeTransactionLegacy(
   assertTransactionLegacy(transaction)
 
   let serializedTransaction = [
-    typeof nonce !== 'undefined' ? toHex(nonce) : '0x',
-    typeof gasPrice !== 'undefined' ? toHex(gasPrice) : '0x',
-    typeof gas !== 'undefined' ? toHex(gas) : '0x',
+    nonce ? toHex(nonce) : '0x',
+    gasPrice ? toHex(gasPrice) : '0x',
+    gas ? toHex(gas) : '0x',
     to ?? '0x',
-    typeof value !== 'undefined' ? toHex(value) : '0x',
+    value ? toHex(value) : '0x',
     data ?? '0x',
   ]