diff --git a/Sources/Packages/Sources/SecretAgentKit/Agent.swift b/Sources/Packages/Sources/SecretAgentKit/Agent.swift
index fbd739e..83ce175 100644
--- a/Sources/Packages/Sources/SecretAgentKit/Agent.swift
+++ b/Sources/Packages/Sources/SecretAgentKit/Agent.swift
@@ -47,6 +47,7 @@ extension Agent {
                 logger.debug("Agent returned \(SSHAgent.Response.agentSignResponse.debugDescription)")
             case .unknown(let value):
                 logger.error("Agent received unknown request of type \(value).")
+                throw UnhandledRequestError()
             default:
                 logger.debug("Agent received valid request of type \(request.debugDescription), but not currently supported.")
                 throw UnhandledRequestError()