diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -77,6 +77,7 @@ add_custom_target(find_version
                 -DREV_MAJOR=${PROJECT_VERSION_MAJOR}
                 -DREV_MINOR=${PROJECT_VERSION_MINOR}
                 -DREV_BUILD=${PROJECT_VERSION_PATCH}
+                -DWINDOWS=${WIN32}
                 -P "${CMAKE_SOURCE_DIR}/cmake/scripts/FindVersion.cmake"
         WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
         BYPRODUCTS ${GENERATED_SOURCE_FILES}
diff --git a/cmake/scripts/FindVersion.cmake b/cmake/scripts/FindVersion.cmake
--- a/cmake/scripts/FindVersion.cmake
+++ b/cmake/scripts/FindVersion.cmake
@@ -138,7 +138,7 @@ else()
     configure_file("${CMAKE_SOURCE_DIR}/src/rev.cpp.in"
             "${FIND_VERSION_BINARY_DIR}/rev.cpp")
 
-    if(WIN32)
+    if(WINDOWS)
         message(STATUS "Generating ottdres.rc")
         configure_file("${CMAKE_SOURCE_DIR}/src/os/windows/ottdres.rc.in"
                 "${FIND_VERSION_BINARY_DIR}/ottdres.rc")