diff --git a/build_mingw32 b/build_mingw32
index 3dd1f3726..b125afa93 100755
--- a/build_mingw32
+++ b/build_mingw32
@@ -1,4 +1,4 @@
 MINGW=/opt/mingw32
 export PATH=$PATH:$MINGW/bin
-cmake .. -DCMAKE_TOOLCHAIN_FILE=cmake/modules/Win32Toolchain.cmake
+cmake .. -DCMAKE_TOOLCHAIN_FILE=../cmake/modules/Win32Toolchain.cmake
 
diff --git a/cmake/modules/Win32Toolchain.cmake b/cmake/modules/Win32Toolchain.cmake
index 6d5030107..afdd54df5 100644
--- a/cmake/modules/Win32Toolchain.cmake
+++ b/cmake/modules/Win32Toolchain.cmake
@@ -36,6 +36,9 @@ SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
 
 SET(PKG_CONFIG_EXECUTABLE ${MINGW_PREFIX}/bin/pkg-config)
 
+SET(CMAKE_C_FLAGS "-march=i686 -mtune=generic")
+SET(CMAKE_CXX_FLAGS ${CMAKE_C_FLAGS})
+
 INCLUDE_DIRECTORIES(${MINGW_PREFIX}/include)
 LINK_DIRECTORIES(${MINGW_PREFIX}/lib ${MINGW_PREFIX}/bin)