diff --git a/raydiumv4.go b/raydiumv4.go
index 6931097..6040d48 100644
--- a/raydiumv4.go
+++ b/raydiumv4.go
@@ -402,11 +402,14 @@ func raydiumv4SwapParser(tx *Tx, instruction Instruction, innerInstructions Inne
 
 func raydiumv4SwapV2Parser(tx *Tx, instruction Instruction, innerInstructions InnerInstructions, offset [2]uint) ([]Swap, [2]uint, error) {
 	accountsLen := len(instruction.Accounts)
-	if accountsLen != 8 {
+	if accountsLen < 8 {
 		return nil, increaseOffset(offset), fmt.Errorf("invalid number of accounts for raydiumv4 swapv2 instruction, offset %d, %d", offset[0], offset[1])
 	}
 	var entryContract = tx.rawTx.accountList[tx.rawTx.Transaction.Message.Instructions[offset[0]].ProgramIDIndex]
 
+	// Raydium's documented V2 layout uses the first 8 accounts. Routed CPI calls
+	// may append extra readonly accounts (for example the Raydium program id) at
+	// the tail, so we only require the canonical prefix here.
 	ammAccount := tx.rawTx.accountList[instruction.Accounts[1]]
 	user := tx.rawTx.accountList[instruction.Accounts[7]]
 	userSourceTokenAccount := tx.rawTx.accountList[instruction.Accounts[5]]
diff --git a/raydiumv4_test.go b/raydiumv4_test.go
new file mode 100644
index 0000000..e8e24fc
--- /dev/null
+++ b/raydiumv4_test.go
@@ -0,0 +1,136 @@
+package pump_parser
+
+import (
+	"encoding/binary"
+	"testing"
+
+	"github.com/gagliardetto/solana-go"
+	"github.com/shopspring/decimal"
+)
+
+func transferInstructionData(amount uint64) solana.Base58 {
+	data := make([]byte, 9)
+	data[0] = 3
+	binary.LittleEndian.PutUint64(data[1:], amount)
+	return solana.Base58(data)
+}
+
+func TestRaydiumV4SwapV2ParserAllowsTrailingReadonlyAccounts(t *testing.T) {
+	t.Parallel()
+
+	accountList := make([]solana.PublicKey, 32)
+	for i := range accountList {
+		accountList[i] = testPublicKey(byte(i + 1))
+	}
+
+	accountList[0] = solana.TokenProgramID
+	accountList[8] = raydiumV4Program
+	accountList[20] = testPublicKey(200)
+	accountList[21] = testPublicKey(201)
+	accountList[22] = testPublicKey(202)
+
+	outerInstruction := Instruction{ProgramIDIndex: 20}
+	swapInstruction := Instruction{
+		Accounts:       []int{0, 1, 2, 3, 4, 5, 6, 7, 8},
+		ProgramIDIndex: 8,
+		Data:           solana.Base58([]byte{raydiumV4SwapBaseInV2Discriminator}),
+	}
+	innerInstructions := InnerInstructions{
+		Index: 0,
+		Instructions: []Instruction{
+			swapInstruction,
+			{
+				Accounts:       []int{5, 4, 7},
+				ProgramIDIndex: 0,
+				Data:           transferInstructionData(55),
+			},
+			{
+				Accounts:       []int{3, 6, 2},
+				ProgramIDIndex: 0,
+				Data:           transferInstructionData(42),
+			},
+		},
+	}
+
+	rawTx := &RawTx{
+		accountList: accountList,
+		Meta: Meta{
+			PostTokenBalances: []TokenBalance{
+				{
+					AccountIndex:     3,
+					MintAccount:      accountList[21],
+					ProgramIDAccount: solana.TokenProgramID,
+					UITokenAmount: UITokenAmount{
+						Amount:   "1000",
+						Decimals: 6,
+					},
+				},
+				{
+					AccountIndex:     4,
+					MintAccount:      accountList[22],
+					ProgramIDAccount: solana.TokenProgramID,
+					UITokenAmount: UITokenAmount{
+						Amount:   "2000",
+						Decimals: 9,
+					},
+				},
+				{
+					AccountIndex:     5,
+					MintAccount:      accountList[22],
+					ProgramIDAccount: solana.TokenProgramID,
+					UITokenAmount: UITokenAmount{
+						Amount:   "300",
+						Decimals: 9,
+					},
+				},
+				{
+					AccountIndex:     6,
+					MintAccount:      accountList[21],
+					ProgramIDAccount: solana.TokenProgramID,
+					UITokenAmount: UITokenAmount{
+						Amount:   "400",
+						Decimals: 6,
+					},
+				},
+			},
+		},
+		Transaction: Transaction{
+			Message: Message{
+				Instructions: []Instruction{outerInstruction},
+			},
+		},
+	}
+
+	tx := &Tx{rawTx: rawTx}
+
+	swaps, nextOffset, err := raydiumv4SwapV2Parser(tx, swapInstruction, innerInstructions, [2]uint{0, 1})
+	if err != nil {
+		t.Fatalf("raydiumv4SwapV2Parser() error = %v", err)
+	}
+	if len(swaps) != 1 {
+		t.Fatalf("raydiumv4SwapV2Parser() swaps len = %d, want 1", len(swaps))
+	}
+	if nextOffset != [2]uint{0, 4} {
+		t.Fatalf("raydiumv4SwapV2Parser() nextOffset = %v, want [0 4]", nextOffset)
+	}
+
+	swap := swaps[0]
+	if swap.Event != "buy" {
+		t.Fatalf("swap.Event = %q, want %q", swap.Event, "buy")
+	}
+	if !swap.Pool.Equals(accountList[1]) {
+		t.Fatalf("swap.Pool = %s, want %s", swap.Pool, accountList[1])
+	}
+	if !swap.User.Equals(accountList[7]) {
+		t.Fatalf("swap.User = %s, want %s", swap.User, accountList[7])
+	}
+	if !swap.EntryContract.Equals(accountList[20]) {
+		t.Fatalf("swap.EntryContract = %s, want %s", swap.EntryContract, accountList[20])
+	}
+	if !swap.BaseAmount.Equal(decimal.NewFromInt(42)) {
+		t.Fatalf("swap.BaseAmount = %s, want 42", swap.BaseAmount)
+	}
+	if !swap.QuoteAmount.Equal(decimal.NewFromInt(55)) {
+		t.Fatalf("swap.QuoteAmount = %s, want 55", swap.QuoteAmount)
+	}
+}