diff --git a/lambda/invoke_loop.go b/lambda/invoke_loop.go
index 0d4397a6..a121773d 100644
--- a/lambda/invoke_loop.go
+++ b/lambda/invoke_loop.go
@@ -111,7 +111,7 @@ func reportFailure(invoke *invoke, invokeErr *messages.InvokeResponse_Error) err
 		return fmt.Errorf("unexpected error occured when serializing the function error cause for X-Ray: %v", err)
 	}
 
-	if err := invoke.xfailure(bytes.NewReader(errorPayload), contentTypeJSON, causeForXRay); err != nil {
+	if err := invoke.failure(bytes.NewReader(errorPayload), contentTypeJSON, causeForXRay); err != nil {
 		return fmt.Errorf("unexpected error occurred when sending the function error to the API: %v", err)
 	}
 	return nil
diff --git a/lambda/runtime_api_client.go b/lambda/runtime_api_client.go
index 298323da..158bd6b4 100644
--- a/lambda/runtime_api_client.go
+++ b/lambda/runtime_api_client.go
@@ -13,8 +13,6 @@ import (
 	"log"
 	"net/http"
 	"runtime"
-
-	"github.com/aws/aws-lambda-go/lambda/messages"
 )
 
 const (
@@ -56,12 +54,6 @@ type invoke struct {
 	client  *runtimeAPIClient
 }
 
-type failure struct {
-	WorkingDirectory string                          `json:"working_directory"`
-	Exceptions       []messages.InvokeResponse_Error `json:"exceptions"`
-	Paths            []string                        `json:"paths"`
-}
-
 // success sends the response payload for an in-progress invocation.
 // Notes:
 //   - An invoke is not complete until next() is called again!
@@ -75,11 +67,7 @@ func (i *invoke) success(body io.Reader, contentType string) error {
 //   - The execution of the function process continues, and is billed, until next() is called again!
 //   - A Lambda Function continues to be re-used for future invokes even after a failure.
 //     If the error is fatal (panic, unrecoverable state), exit the process immediately after calling failure()
-func (i *invoke) failure(body io.Reader, contentType string) error {
-	return i.xfailure(body, contentType, nil)
-}
-
-func (i *invoke) xfailure(body io.Reader, contentType string, causeForXRay []byte) error {
+func (i *invoke) failure(body io.Reader, contentType string, causeForXRay []byte) error {
 	url := i.client.baseURL + i.id + "/error"
 	return i.client.post(url, body, contentType, causeForXRay)
 }
diff --git a/lambda/runtime_api_client_test.go b/lambda/runtime_api_client_test.go
index 7ccd47fb..3f41403f 100644
--- a/lambda/runtime_api_client_test.go
+++ b/lambda/runtime_api_client_test.go
@@ -92,7 +92,7 @@ func TestClientDoneAndError(t *testing.T) {
 			assert.NoError(t, err)
 		})
 		t.Run(fmt.Sprintf("happy Error with payload[%d]", i), func(t *testing.T) {
-			err := invoke.failure(bytes.NewReader(payload), contentTypeJSON)
+			err := invoke.failure(bytes.NewReader(payload), contentTypeJSON, nil)
 			assert.NoError(t, err)
 		})
 	}
@@ -105,7 +105,7 @@ func TestInvalidRequestsForMalformedEndpoint(t *testing.T) {
 	require.Error(t, err)
 	err = (&invoke{client: newRuntimeAPIClient("🚨")}).success(nil, "")
 	require.Error(t, err)
-	err = (&invoke{client: newRuntimeAPIClient("🚨")}).failure(nil, "")
+	err = (&invoke{client: newRuntimeAPIClient("🚨")}).failure(nil, "", nil)
 	require.Error(t, err)
 }
 
@@ -145,7 +145,7 @@ func TestStatusCodes(t *testing.T) {
 					require.NoError(t, err)
 				})
 				t.Run("failure should not error", func(t *testing.T) {
-					err := invoke.failure(nil, "")
+					err := invoke.failure(nil, "", nil)
 					require.NoError(t, err)
 				})
 			} else {
@@ -158,7 +158,7 @@ func TestStatusCodes(t *testing.T) {
 					}
 				})
 				t.Run("failure should error", func(t *testing.T) {
-					err := invoke.failure(nil, "")
+					err := invoke.failure(nil, "", nil)
 					require.Error(t, err)
 					if i != 301 && i != 302 && i != 303 {
 						assert.Contains(t, err.Error(), "unexpected status code")