diff --git a/ixwebsocket/IXSocketMbedTLS.cpp b/ixwebsocket/IXSocketMbedTLS.cpp
index c45c7676..2e5a974f 100644
--- a/ixwebsocket/IXSocketMbedTLS.cpp
+++ b/ixwebsocket/IXSocketMbedTLS.cpp
@@ -39,6 +39,10 @@ namespace ix
         mbedtls_entropy_init(&_entropy);
         mbedtls_x509_crt_init(&_cacert);
         mbedtls_x509_crt_init(&_cert);
+        mbedtls_pk_init(&_pkey);
+        // FIXME: This will only work for RSA Private keys, what about other types? (ECDSA for
+        // example)
+        mbedtls_pk_setup(&_pkey, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA));
     }
 
     bool SocketMbedTLS::init(const std::string& host, bool isClient, std::string& errMsg)