diff --git a/prelude.f b/prelude.f
index 098e418..1359a98 100644
--- a/prelude.f
+++ b/prelude.f
@@ -244,9 +244,9 @@ CHAR . EMIT
 
 \ Version number
 
-: VERSION-MAJOR 0 ;
-: VERSION-MINOR 1 ;
-: VERSION-PATCH 0 ;
+0 CONSTANT VERSION-MAJOR
+0 CONSTANT VERSION-MINOR
+0 CONSTANT VERSION-PATCH
 
 : VERSION-PRINT
   ." v" VERSION-MAJOR .