diff --git a/scripts-available/CDB_XYZ.sql b/scripts-available/CDB_XYZ.sql
index fa38171..58b1998 100644
--- a/scripts-available/CDB_XYZ.sql
+++ b/scripts-available/CDB_XYZ.sql
@@ -6,7 +6,7 @@ CREATE OR REPLACE FUNCTION CDB_XYZ_Resolution(z INTEGER)
 RETURNS FLOAT8
 AS $$
   -- circumference divided by 256 is z0 resolution, then divide by 2^z
-  SELECT 40075017 / 256 / power(2, z);
+  SELECT 40075017.0 / 256 / power(2, z);
 $$ LANGUAGE SQL IMMUTABLE STRICT;
 -- }