diff --git a/CMakeLists.txt b/CMakeLists.txt
index b8c39eea4..5e3c8c393 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -54,13 +54,19 @@ pkg_check_modules (SIGC    REQUIRED sigc++-2.0)
 if (WIN32)
     set (EXTRA_LIBDIR "${CMAKE_CURRENT_SOURCE_DIR}/lib")
     set (EXTRA_INCDIR "${CMAKE_CURRENT_SOURCE_DIR}/winclude")
-    set (EXTRA_LIB "ws2_32")
+    set (EXTRA_LIB "-lws2_32")
     set (IPTCDATA_LIBRARIES iptcdata)
     set (LCMS_LIBRARIES liblcms.a)
     set (JPEG_LIBRARIES libjpeg.a)
     set (PNG_LIBRARIES libpng.a)
     set (TIFF_LIBRARIES libtiff.a)
     set (ZLIB_LIBRARIES libz.a)
+
+    add_definitions (-DWIN32)
+    add_definitions (-D_WIN32)
+    if (MINGW)
+        add_definitions (-D__MINGW32__)
+    endif (MINGW)
 else (WIN32)
     pkg_check_modules (IPTCDATA REQUIRED libiptcdata)
     pkg_check_modules (LCMS    REQUIRED lcms)