diff --git a/CONTRIBUTORS.txt b/CONTRIBUTORS.txt
index 2699c0d53d..8f5fdada71 100644
--- a/CONTRIBUTORS.txt
+++ b/CONTRIBUTORS.txt
@@ -40,6 +40,10 @@ Chris O'Gorman (chogorma)
 Ocedo GmbH
 Henning Pfeiffer (megaposer)
 
+neXenio GmbH
+Patrik Fiedler (xqp)
+René Meusel (reneme)
+
 thomasschaub
 
 Trimble
diff --git a/Release/include/cpprest/details/x509_cert_utilities.h b/Release/include/cpprest/details/x509_cert_utilities.h
index f07f20091f..bca584883c 100644
--- a/Release/include/cpprest/details/x509_cert_utilities.h
+++ b/Release/include/cpprest/details/x509_cert_utilities.h
@@ -16,7 +16,7 @@
 #include <string>
 #include "cpprest/certificate_info.h"
 
-#if defined(__APPLE__) || (defined(ANDROID) || defined(__ANDROID__)) || (defined(_WIN32)  && !defined(__cplusplus_winrt) && !defined(_M_ARM) && !defined(CPPREST_EXCLUDE_WEBSOCKETS))
+#if defined(__linux__) || defined(__APPLE__) || (defined(ANDROID) || defined(__ANDROID__)) || (defined(_WIN32)  && !defined(__cplusplus_winrt) && !defined(_M_ARM) && !defined(CPPREST_EXCLUDE_WEBSOCKETS))
 
 #if defined(_MSC_VER)
 #pragma warning(push)
@@ -38,6 +38,7 @@ namespace web { namespace http { namespace client { namespace details {
 
 using namespace utility;
 
+#if !defined(__linux__)
 
 bool is_end_certificate_in_chain(boost::asio::ssl::verify_context &verifyCtx);
 
@@ -49,9 +50,11 @@ bool is_end_certificate_in_chain(boost::asio::ssl::verify_context &verifyCtx);
 /// <param name="hostName">Host name from the URI.</param>
 /// <returns>True if verification passed and server can be trusted, false otherwise.</returns>
 bool verify_cert_chain_platform_specific(boost::asio::ssl::verify_context &verifyCtx, const std::string &hostName, const CertificateChainFunction& func = nullptr);
-
 bool verify_X509_cert_chain(const std::vector<std::string> &certChain, const std::string &hostName, const CertificateChainFunction& func = nullptr);
 
+#endif
+
+
 std::vector<std::vector<unsigned char>> get_X509_cert_chain_encoded_data(boost::asio::ssl::verify_context &verifyCtx);
 
 }}}}
diff --git a/Release/src/http/client/x509_cert_utilities.cpp b/Release/src/http/client/x509_cert_utilities.cpp
index ecfe4a58b4..ef8af05f0c 100644
--- a/Release/src/http/client/x509_cert_utilities.cpp
+++ b/Release/src/http/client/x509_cert_utilities.cpp
@@ -13,7 +13,7 @@
 
 #include "stdafx.h"
 
-#if defined(__APPLE__) || (defined(ANDROID) || defined(__ANDROID__)) || (defined(_WIN32)  && !defined(__cplusplus_winrt) && !defined(_M_ARM) && !defined(CPPREST_EXCLUDE_WEBSOCKETS))
+#if defined(__linux__) || defined(__APPLE__) || (defined(ANDROID) || defined(__ANDROID__)) || (defined(_WIN32)  && !defined(__cplusplus_winrt) && !defined(_M_ARM) && !defined(CPPREST_EXCLUDE_WEBSOCKETS))
 
 #include "cpprest/details/x509_cert_utilities.h"
 #include <vector>
@@ -40,6 +40,8 @@
 
 namespace web { namespace http { namespace client { namespace details {
 
+#if !defined(__linux__)
+
 bool is_end_certificate_in_chain(boost::asio::ssl::verify_context &verifyCtx)
 {
     X509_STORE_CTX *storeContext = verifyCtx.native_handle();
@@ -104,6 +106,8 @@ bool verify_cert_chain_platform_specific(boost::asio::ssl::verify_context &verif
     return verify_result;
 }
 
+#endif
+
 #if defined(ANDROID) || defined(__ANDROID__)
 using namespace crossplat;