diff --git a/CMakeLists.txt b/CMakeLists.txt
index 189a71a..9c79d28 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -64,7 +64,9 @@ if (MINGW OR MSVC)
     if (UNIX)
         SET(CMAKE_RC_COMPILE_OBJECT
                 "<CMAKE_RC_COMPILER> <FLAGS> -O coff <DEFINES> -i <SOURCE> -o <OBJECT>")
-        SET(CMAKE_RC_COMPILER i686-w64-mingw32-windres)
+        if (NOT DEFINED CMAKE_RC_COMPILER)
+            SET(CMAKE_RC_COMPILER i686-w64-mingw32-windres)
+        endif()
     endif()
     ENABLE_LANGUAGE(RC)
 endif()