diff --git a/SecretAgentKit/Agent.swift b/SecretAgentKit/Agent.swift
index 3d48fbd..f10f882 100644
--- a/SecretAgentKit/Agent.swift
+++ b/SecretAgentKit/Agent.swift
@@ -27,7 +27,7 @@ extension Agent {
         guard !data.isEmpty else { return }
         let requestTypeInt = data[4]
         guard let requestType = SSHAgent.RequestType(rawValue: requestTypeInt) else {
-            writer.write(SSHAgent.ResponseType.agentFailure.data)
+            writer.write(OpenSSHKeyWriter().lengthAndData(of: SSHAgent.ResponseType.agentFailure.data))
             os_log(.debug, "Agent returned %@", SSHAgent.ResponseType.agentFailure.debugDescription)
             return
         }
diff --git a/SecretAgentKitTests/AgentTests.swift b/SecretAgentKitTests/AgentTests.swift
index c570018..cc5ecbd 100644
--- a/SecretAgentKitTests/AgentTests.swift
+++ b/SecretAgentKitTests/AgentTests.swift
@@ -41,6 +41,7 @@ class AgentTests: XCTestCase {
         agent.handle(reader: stubReader, writer: stubWriter)
         let reader = OpenSSHReader(data: stubWriter.data)
         // TODO: VERIFY
+        XCTAssertFalse(true)
         print(stubWriter.data.base64EncodedString())
     }
 
@@ -87,7 +88,7 @@ class AgentTests: XCTestCase {
     // MARK: Exception Handling
 
     func testSignatureException() {
-        let stubReader = StubFileHandleReader(availableData: Constants.Requests.requestIdentities)
+        let stubReader = StubFileHandleReader(availableData: Constants.Requests.requestSignature)
         let list = storeList(with: [Constants.Secrets.ecdsa256Secret, Constants.Secrets.ecdsa384Secret])
         let store = list.stores.first?.base as! Stub.Store
         store.shouldThrow = true