diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0d2d0d3d40..7e2ea2ed1f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,8 +17,6 @@ if(NOT CMAKE_CONFIGURATION_TYPES)
     endif()
 endif()
 
-file(TO_CMAKE_PATH "${CMAKE_INSTALL_PREFIX}" CMAKE_INSTALL_PREFIX)
-
 # https://blog.kitware.com/cmake-and-the-default-build-type/
 if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
     set(default_build_type "Debug")
diff --git a/build/cmake/main.cmake b/build/cmake/main.cmake
index 9dc1b06997..1031a3e092 100644
--- a/build/cmake/main.cmake
+++ b/build/cmake/main.cmake
@@ -9,6 +9,8 @@
 
 list(APPEND CMAKE_MODULE_PATH "${wxSOURCE_DIR}/build/cmake/modules")
 
+file(TO_CMAKE_PATH "${CMAKE_INSTALL_PREFIX}" CMAKE_INSTALL_PREFIX)
+
 include(build/cmake/files.cmake)            # Files list
 include(build/cmake/source_groups.cmake)    # Source group definitions
 include(build/cmake/functions.cmake)        # wxWidgets functions