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")