diff --git a/.github/workflows/build-windows.yml b/.github/workflows/build-windows.yml
index 102b0b70..0a96ffcd 100644
--- a/.github/workflows/build-windows.yml
+++ b/.github/workflows/build-windows.yml
@@ -31,6 +31,9 @@ jobs:
         msystem: ${{ matrix.msystem }}
         install: base-devel git mingw-w64-${{ matrix.arch }}-${{ matrix.compiler }} mingw-w64-${{ matrix.arch }}-boost mingw-w64-${{ matrix.arch }}-openssl mingw-w64-${{ matrix.arch }}-miniupnpc
         update: true
+    - name: Install additional clang packages
+      if: ${{ matrix.msystem == 'CLANG64' }}
+      run: pacman --noconfirm -S mingw-w64-${{ matrix.arch }}-gcc-compat
     - name: Build application
       run: |
         mkdir -p obj/Win32 obj/libi2pd obj/libi2pd_client obj/daemon
diff --git a/build/CMakeLists.txt b/build/CMakeLists.txt
index fc0d5a46..3ac2f61a 100644
--- a/build/CMakeLists.txt
+++ b/build/CMakeLists.txt
@@ -320,6 +320,13 @@ if(WITH_BINARY)
     list(REMOVE_AT Boost_LIBRARIES -1)
   endif()
 
+  # synchronization library is incompatible with Windows 7
+  if(WIN32)
+    get_target_property(BOOSTFSLIBS Boost::filesystem INTERFACE_LINK_LIBRARIES)
+    list(REMOVE_ITEM BOOSTFSLIBS synchronization)
+	set_target_properties(Boost::filesystem PROPERTIES INTERFACE_LINK_LIBRARIES "${BOOSTFSLIBS}")
+  endif()
+
   if(WITH_STATIC)
     set(DL_LIB ${CMAKE_DL_LIBS})
   endif()