diff --git a/util/buildbot/buildwin32.sh b/util/buildbot/buildwin32.sh
index e62d32969..a296d9999 100755
--- a/util/buildbot/buildwin32.sh
+++ b/util/buildbot/buildwin32.sh
@@ -20,8 +20,10 @@ packagedir=$builddir/packages
 libdir=$builddir/libs
 
 # Test which win32 compiler is present
-which i586-mingw32msvc-windres &>/dev/null && toolchain_file=$dir/toolchain_i586-mingw32msvc.cmake
-which i686-w64-mingw32-windres &>/dev/null && toolchain_file=$dir/toolchain_i646-w64-mingw32.cmake
+which i686-w64-mingw32-gcc &>/dev/null &&
+	toolchain_file=$dir/toolchain_i686-w64-mingw32.cmake
+which i686-w64-mingw32-gcc-posix &>/dev/null &&
+	toolchain_file=$dir/toolchain_i686-w64-mingw32-posix.cmake
 
 if [ -z "$toolchain_file" ]; then
 	echo "Unable to determine which mingw32 compiler to use"
diff --git a/util/buildbot/toolchain_i586-mingw32msvc.cmake b/util/buildbot/toolchain_i686-w64-mingw32-posix.cmake
similarity index 58%
rename from util/buildbot/toolchain_i586-mingw32msvc.cmake
rename to util/buildbot/toolchain_i686-w64-mingw32-posix.cmake
index 0eeefb84d..b5d9ba5c4 100644
--- a/util/buildbot/toolchain_i586-mingw32msvc.cmake
+++ b/util/buildbot/toolchain_i686-w64-mingw32-posix.cmake
@@ -2,12 +2,14 @@
 SET(CMAKE_SYSTEM_NAME Windows)
 
 # which compilers to use for C and C++
-SET(CMAKE_C_COMPILER i586-mingw32msvc-gcc)
-SET(CMAKE_CXX_COMPILER i586-mingw32msvc-g++)
-SET(CMAKE_RC_COMPILER i586-mingw32msvc-windres)
+# *-posix is Ubuntu's naming for the MinGW variant that comes with support
+# for pthreads / std::thread (required by MT)
+SET(CMAKE_C_COMPILER i686-w64-mingw32-gcc-posix)
+SET(CMAKE_CXX_COMPILER i686-w64-mingw32-g++-posix)
+SET(CMAKE_RC_COMPILER i686-w64-mingw32-windres)
 
 # here is the target environment located
-SET(CMAKE_FIND_ROOT_PATH /usr/i586-mingw32msvc)
+SET(CMAKE_FIND_ROOT_PATH /usr/i686-w64-mingw32)
 
 # adjust the default behaviour of the FIND_XXX() commands:
 # search headers and libraries in the target environment, search
diff --git a/util/buildbot/toolchain_i646-w64-mingw32.cmake b/util/buildbot/toolchain_i686-w64-mingw32.cmake
similarity index 100%
rename from util/buildbot/toolchain_i646-w64-mingw32.cmake
rename to util/buildbot/toolchain_i686-w64-mingw32.cmake