diff --git a/txnbuild/invoke_host_function.go b/txnbuild/invoke_host_function.go
index eeb0ef6ca7..1a11a9baa3 100644
--- a/txnbuild/invoke_host_function.go
+++ b/txnbuild/invoke_host_function.go
@@ -8,6 +8,7 @@ import (
 type InvokeHostFunction struct {
 	Function      xdr.HostFunction
 	Footprint     xdr.LedgerFootprint
+	Auth          []xdr.ContractAuth
 	SourceAccount string
 }
 
@@ -17,6 +18,7 @@ func (f *InvokeHostFunction) BuildXDR() (xdr.Operation, error) {
 	xdrOp := xdr.InvokeHostFunctionOp{
 		Function:  f.Function,
 		Footprint: f.Footprint,
+		Auth:      f.Auth,
 	}
 
 	body, err := xdr.NewOperationBody(opType, xdrOp)
@@ -37,6 +39,7 @@ func (f *InvokeHostFunction) FromXDR(xdrOp xdr.Operation) error {
 	}
 
 	f.SourceAccount = accountFromXDR(xdrOp.SourceAccount)
+	f.Auth = result.Auth
 	f.Footprint = result.Footprint
 	f.Function = result.Function
 
diff --git a/txnbuild/invoke_host_function_test.go b/txnbuild/invoke_host_function_test.go
index ee7bed6a8e..266028d88c 100644
--- a/txnbuild/invoke_host_function_test.go
+++ b/txnbuild/invoke_host_function_test.go
@@ -52,6 +52,7 @@ func TestInvokeHostFunctionRoundTrip(t *testing.T) {
 		Type: xdr.ScObjectTypeScoI64,
 		I64:  &i64,
 	}
+	accountId := xdr.MustAddress("GB7BDSZU2Y27LYNLALKKALB52WS2IZWYBDGY6EQBLEED3TJOCVMZRH7H")
 	invokeHostFunctionOp := &InvokeHostFunction{
 		Function: xdr.HostFunction{
 			Type: xdr.HostFunctionTypeHostFunctionTypeInvokeContract,
@@ -62,6 +63,24 @@ func TestInvokeHostFunctionRoundTrip(t *testing.T) {
 				},
 			},
 		},
+		Auth: []xdr.ContractAuth{
+			{
+				AddressWithNonce: &xdr.AddressWithNonce{
+					Address: xdr.ScAddress{
+						Type:      xdr.ScAddressTypeScAddressTypeAccount,
+						AccountId: &accountId,
+					},
+					Nonce: 0,
+				},
+				RootInvocation: xdr.AuthorizedInvocation{
+					ContractId:     xdr.Hash{0xaa, 0xbb},
+					FunctionName:   "foo",
+					Args:           nil,
+					SubInvocations: nil,
+				},
+				SignatureArgs: nil,
+			},
+		},
 		Footprint: xdr.LedgerFootprint{
 			ReadOnly: []xdr.LedgerKey{
 				{