1 files changed, 3 insertions, 3 deletions
diff --git a/version.c b/version.c
index 09569e9d7b..838266dacb 100644
--- a/version.c
+++ b/version.c
@@ -17,9 +17,9 @@
 void
 Init_version()
 {
-    VALUE v = rb_str_new2(RUBY_VERSION);
-    VALUE d = rb_str_new2(RUBY_RELEASE_DATE);
-    VALUE p = rb_str_new2(RUBY_PLATFORM);
+    VALUE v = rb_obj_freeze(rb_str_new2(RUBY_VERSION));
+    VALUE d = rb_obj_freeze(rb_str_new2(RUBY_RELEASE_DATE));
+    VALUE p = rb_obj_freeze(rb_str_new2(RUBY_PLATFORM));
 
     rb_define_global_const("RUBY_VERSION", v);
     rb_define_global_const("RUBY_RELEASE_DATE", d);