diff --git a/cpprest-2.10.1-fix-warning-due-to-boost-1.66.patch b/cpprest-2.10.1-fix-warning-due-to-boost-1.66.patch
new file mode 100644
index 0000000..0ad1de4
--- /dev/null
+++ b/cpprest-2.10.1-fix-warning-due-to-boost-1.66.patch
@@ -0,0 +1,28 @@
+From 17a198081379384ed9373828f905592ce9c4bdf3 Mon Sep 17 00:00:00 2001
+From: Robert Schumacher <roschuma@microsoft.com>
+Date: Wed, 3 Jan 2018 14:09:36 -0800
+Subject: [PATCH] Fix warning due to boost 1.66
+
+---
+ Release/include/pplx/threadpool.h | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/Release/include/pplx/threadpool.h b/Release/include/pplx/threadpool.h
+index c67db358..db1e97c8 100644
+--- a/Release/include/pplx/threadpool.h
++++ b/Release/include/pplx/threadpool.h
+@@ -67,9 +67,10 @@ public:
+     boost::asio::io_service& service() { return m_service; }
+ 
+ protected:
+-    threadpool(size_t num_threads) : m_service(num_threads) {}
++    threadpool(size_t num_threads) : m_service(static_cast<int>(num_threads)) {}
+ 
+     boost::asio::io_service m_service;
+ };
+ 
+ }
++
+-- 
+2.14.3
+
diff --git a/cpprest.spec b/cpprest.spec
index ef0e1a7..ac96418 100644
--- a/cpprest.spec
+++ b/cpprest.spec
@@ -2,7 +2,7 @@
 %define minor 10
 Name:           cpprest
 Version:        2.10.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        C++ REST library
 License:        MIT
 Url:            https://github.com/Microsoft/cpprestsdk
@@ -13,6 +13,9 @@ Patch1:         cpprest-2.10.0-disable-outside-and-failing-tests.patch
 Patch2:         cpprest-2.10.0-disable-tests-long-timeouts.patch
 # Disable test extract_floating_point, which fails on ppc64le and aarch64
 Patch3:         cpprest-2.9.1-disable-test-extract_floating_point.patch
+# Fix warning due to boost 1.66
+# https://github.com/Microsoft/cpprestsdk/commit/17a198081379384ed9373828f905592ce9c4bdf3
+Patch4:         cpprest-2.10.1-fix-warning-due-to-boost-1.66.patch
 
 BuildRequires:  boost-devel >= 1.55
 BuildRequires:  cmake >= 3.0
@@ -52,7 +55,7 @@ cd Release
 mkdir build.release
 cd build.release
 export CXXFLAGS="%{optflags} -Wl,--as-needed"
-%cmake .. -DCMAKE_BUILD_TYPE=Release
+%cmake .. -DCMAKE_BUILD_TYPE=Release -DWERROR=OFF
 make %{?_smp_mflags}
 
 %install
@@ -88,6 +91,11 @@ cd Release/build.release/Binaries
 
 
 %changelog
+* Sun Feb 11 2018 Wolfgang Stöggl <c72578@yahoo.de> - 2.10.1-4
+- Rebuilt for Boost 1.66
+- Added patch to fix warning due to boost 1.66
+- Pass -DWERROR=OFF to cmake
+
 * Wed Feb 07 2018 Fedora Release Engineering <releng@fedoraproject.org> - 2.10.1-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild