diff --git a/cmake/packages/nsis.cmake b/cmake/packages/nsis.cmake
index 38c2373d19..eaeeb772b6 100644
--- a/cmake/packages/nsis.cmake
+++ b/cmake/packages/nsis.cmake
@@ -8,7 +8,8 @@ set(CPACK_NSIS_MODIFY_PATH         ON)
 set(CPACK_NSIS_ENABLE_UNINSTALL_BEFORE_INSTALL 1)
 set(CPACK_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/Installation/Windows/Templates")
 set(CPACK_PLUGIN_PATH "${CMAKE_CURRENT_SOURCE_DIR}/Installation/Windows/Plugins")
-
+# want @ in @only nsis template:
+set(CPACK_ROOTDIR "@ROOTDIR@")
 if (CMAKE_CL_64)
   # this needs to remain a $string for the template:
   SET(CPACK_NSIS_INSTALL_ROOT "$PROGRAMFILES64")