diff --git a/Modules/FindRuby.cmake b/Modules/FindRuby.cmake
index d6804e12bb..2a389b062b 100644
--- a/Modules/FindRuby.cmake
+++ b/Modules/FindRuby.cmake
@@ -376,16 +376,16 @@ if (Ruby_EXECUTABLE AND NOT Ruby_EXECUTABLE STREQUAL "${_Ruby_EXECUTABLE_LAST_QU
   set(Ruby_VERSION_MAJOR ${Ruby_VERSION_MAJOR} CACHE PATH "The Ruby major version" FORCE)
   set(Ruby_VERSION_MINOR ${Ruby_VERSION_MINOR} CACHE PATH "The Ruby minor version" FORCE)
   set(Ruby_VERSION_PATCH ${Ruby_VERSION_PATCH} CACHE PATH "The Ruby patch version" FORCE)
-  set(Ruby_ARCH_DIR ${Ruby_ARCH_DIR} CACHE PATH "The Ruby arch dir" FORCE)
-  set(Ruby_HDR_DIR ${Ruby_HDR_DIR} CACHE PATH "The Ruby header dir (1.9+)" FORCE)
-  set(Ruby_ARCHHDR_DIR ${Ruby_ARCHHDR_DIR} CACHE PATH "The Ruby arch header dir (2.0+)" FORCE)
-  set(_Ruby_POSSIBLE_LIB_DIR ${_Ruby_POSSIBLE_LIB_DIR} CACHE PATH "The Ruby lib dir" FORCE)
-  set(Ruby_RUBY_LIB_DIR ${Ruby_RUBY_LIB_DIR} CACHE PATH "The Ruby ruby-lib dir" FORCE)
-  set(Ruby_SITEARCH_DIR ${Ruby_SITEARCH_DIR} CACHE PATH "The Ruby site arch dir" FORCE)
-  set(Ruby_SITELIB_DIR ${Ruby_SITELIB_DIR} CACHE PATH "The Ruby site lib dir" FORCE)
+  set(Ruby_ARCH_DIR ${Ruby_ARCH_DIR} CACHE INTERNAL "The Ruby arch dir" FORCE)
+  set(Ruby_HDR_DIR ${Ruby_HDR_DIR} CACHE INTERNAL "The Ruby header dir (1.9+)" FORCE)
+  set(Ruby_ARCHHDR_DIR ${Ruby_ARCHHDR_DIR} CACHE INTERNAL "The Ruby arch header dir (2.0+)" FORCE)
+  set(_Ruby_POSSIBLE_LIB_DIR ${_Ruby_POSSIBLE_LIB_DIR} CACHE INTERNAL "The Ruby lib dir" FORCE)
+  set(Ruby_RUBY_LIB_DIR ${Ruby_RUBY_LIB_DIR} CACHE INTERNAL "The Ruby ruby-lib dir" FORCE)
+  set(Ruby_SITEARCH_DIR ${Ruby_SITEARCH_DIR} CACHE INTERNAL "The Ruby site arch dir" FORCE)
+  set(Ruby_SITELIB_DIR ${Ruby_SITELIB_DIR} CACHE INTERNAL "The Ruby site lib dir" FORCE)
   set(Ruby_HAS_VENDOR_RUBY ${Ruby_HAS_VENDOR_RUBY} CACHE BOOL "Vendor Ruby is available" FORCE)
-  set(Ruby_VENDORARCH_DIR ${Ruby_VENDORARCH_DIR} CACHE PATH "The Ruby vendor arch dir" FORCE)
-  set(Ruby_VENDORLIB_DIR ${Ruby_VENDORLIB_DIR} CACHE PATH "The Ruby vendor lib dir" FORCE)
+  set(Ruby_VENDORARCH_DIR ${Ruby_VENDORARCH_DIR} CACHE INTERNAL "The Ruby vendor arch dir" FORCE)
+  set(Ruby_VENDORLIB_DIR ${Ruby_VENDORLIB_DIR} CACHE INTERNAL "The Ruby vendor lib dir" FORCE)
 
   mark_as_advanced(
       Ruby_ARCH_DIR