diff --git a/accounts/abi/abi_test.go b/accounts/abi/abi_test.go
index 2d43b631c2..11bf693a02 100644
--- a/accounts/abi/abi_test.go
+++ b/accounts/abi/abi_test.go
@@ -55,6 +55,87 @@ const jsondata2 = `
 	{ "type" : "function", "name" : "sliceMultiAddress", "constant" : false, "inputs" : [ { "name" : "a", "type" : "address[]" }, { "name" : "b", "type" : "address[]" } ] }
 ]`
 
+const NettingChannelLibraryABI = `
+[
+	{
+		"constant": false,
+		"inputs": [
+			{
+				"name": "locked_encoded",
+				"type": "bytes"
+			},
+			{
+				"name": "merkle_proof",
+				"type": "bytes"
+			},
+			{
+				"name": "secret",
+				"type": "bytes32"
+			}
+		],
+		"name": "withdraw",
+		"outputs": [],
+		"payable": false,
+		"stateMutability": "nonpayable",
+		"type": "function"
+	},
+	{
+		"constant": false,
+		"inputs": [
+			{
+				"name": "self",
+				"type": "NettingChannelLibrary.Data storage"
+			},
+			{
+				"name": "amount",
+				"type": "uint256"
+			}
+		],
+		"name": "deposit",
+		"outputs": [
+			{
+				"name": "success",
+				"type": "bool"
+			},
+			{
+				"name": "balance",
+				"type": "uint256"
+			}
+		],
+		"payable": false,
+		"stateMutability": "nonpayable",
+		"type": "function"
+	},
+	{
+		"constant": true,
+		"inputs": [],
+		"name": "contract_version",
+		"outputs": [
+			{
+				"name": "",
+				"type": "string"
+			}
+		],
+		"payable": false,
+		"stateMutability": "view",
+		"type": "function"
+	}
+]
+`
+
+func TestNewUserType(t *testing.T) {
+	_, err := NewType("NettingChannelLibrary.Data storage")
+	if err != nil {
+		t.Error(err)
+	}
+	abi, err := JSON(strings.NewReader(NettingChannelLibraryABI))
+	if err != nil {
+		t.Error(err)
+	}
+	if _, err := abi.Pack("withdraw", []byte{1, 2, 3}, []byte{1, 2, 3}, [32]byte{1, 2, 3}); err != nil {
+		t.Error(err)
+	}
+}
 func TestReader(t *testing.T) {
 	Uint256, _ := NewType("uint256")
 	exp := ABI{
diff --git a/accounts/abi/bind/bind.go b/accounts/abi/bind/bind.go
index 8175e3cb9b..cf430477a4 100644
--- a/accounts/abi/bind/bind.go
+++ b/accounts/abi/bind/bind.go
@@ -26,7 +26,6 @@ import (
 	"regexp"
 	"strings"
 	"text/template"
-	"unicode"
 
 	"github.com/ethereum/go-ethereum/accounts/abi"
 	"golang.org/x/tools/imports"
@@ -55,20 +54,22 @@ func Bind(types []string, abis []string, bytecodes []string, pkg string, lang La
 		if err != nil {
 			return "", err
 		}
-		// Strip any whitespace from the JSON ABI
-		strippedABI := strings.Map(func(r rune) rune {
-			if unicode.IsSpace(r) {
-				return -1
-			}
-			return r
-		}, abis[i])
-
 		// Extract the call and transact methods, and sort them alphabetically
 		var (
 			calls     = make(map[string]*tmplMethod)
 			transacts = make(map[string]*tmplMethod)
 		)
 		for _, original := range evmABI.Methods {
+			skipMethodWithUserType := false
+			for _, input := range original.Inputs {
+				if input.Type.T == abi.UserTy {
+					skipMethodWithUserType = true
+					break
+				}
+			}
+			if skipMethodWithUserType {
+				continue //skip this method
+			}
 			// Normalize the method for capital cases and non-anonymous inputs/outputs
 			normalized := original
 			normalized.Name = methodNormalizer[lang](original.Name)
@@ -96,7 +97,7 @@ func Bind(types []string, abis []string, bytecodes []string, pkg string, lang La
 		}
 		contracts[types[i]] = &tmplContract{
 			Type:        capitalise(types[i]),
-			InputABI:    strings.Replace(strippedABI, "\"", "\\\"", -1),
+			InputABI:    strings.Replace(abis[i], "\"", "\\\"", -1),
 			InputBin:    strings.TrimSpace(bytecodes[i]),
 			Constructor: evmABI.Constructor,
 			Calls:       calls,
diff --git a/accounts/abi/type.go b/accounts/abi/type.go
index a1f13ffa29..74dfd30a03 100644
--- a/accounts/abi/type.go
+++ b/accounts/abi/type.go
@@ -38,6 +38,7 @@ const (
 	HashTy
 	FixedPointTy
 	FunctionTy
+	UserTy
 )
 
 // Type is the reflection of the supported argument type
@@ -159,7 +160,13 @@ func NewType(t string) (typ Type, err error) {
 		typ.Size = 24
 		typ.Type = reflect.ArrayOf(24, reflect.TypeOf(byte(0)))
 	default:
-		return Type{}, fmt.Errorf("unsupported arg type: %s", t)
+		//user defined types
+		typ.Kind = reflect.Struct
+		typ.T = UserTy
+		typ.Size = -1
+		typ.Type = reflect.TypeOf(struct{}{})
+		//default:
+		//	return Type{}, fmt.Errorf("unsupported arg type: %s", t)
 	}
 
 	return