diff --git a/cmake/QtPostProcessHelpers.cmake b/cmake/QtPostProcessHelpers.cmake
index 4f8106dfa..bec5c402e 100644
--- a/cmake/QtPostProcessHelpers.cmake
+++ b/cmake/QtPostProcessHelpers.cmake
@@ -414,7 +414,7 @@ function(qt_generate_install_prefixes out_var)
 
     foreach(var ${vars})
         get_property(docstring CACHE "${var}" PROPERTY HELPSTRING)
-        string(APPEND content "set(${var} \"${${var}}\" CACHE STRING \"${docstring}\" FORCE)\n")
+        string(APPEND content "set(${var} \"${${var}}\" CACHE STRING \"${docstring}\")\n")
     endforeach()
 
     set(${out_var} "${content}" PARENT_SCOPE)