diff --git a/modules/frep/shapes/3D/menger b/modules/frep/shapes/3D/menger
index 249b6cbee1239f63be3d617c20a5f63368ac0e74..19c2e18098729b679c282394ca824826e9778cdc 100755
--- a/modules/frep/shapes/3D/menger
+++ b/modules/frep/shapes/3D/menger
@@ -51,7 +51,7 @@ var outputs = {
          var fn = `Math.min(${fn},Math.min(Y-0,${size}-Y))`
          var fn = `Math.min(${fn},Math.min(Z-0,${size}-Z))`
          for (var d = 0; d < depth; ++d) {
-            var fn = `Math.min(${fn},-Math.min(Math.min((Math.pow(3,${d})*X/${size})%1-1/3,2/3-(Math.pow(3,${d})*X/${size})%1),Math.min((Math.pow(3,${d})*Y/${size})%1-1/3,2/3-(Math.pow(3,${d})*Y/${size})%1)))`
+            var fn = `Math.min(${fn},-Math.min(Math.min((Math.pow(3,${d})*X/${size})%1-1/3,2/3-(Math.pow(3,${d})*X/${size})%1),Math.min(Math.min((Math.pow(3,${d})*Y/${size})%1-1/3,2/3-(Math.pow(3,${d})*Y/${size})%1),Math.min((Math.pow(3,${d})*Z/${size})%1-1/3,2/3-(Math.pow(3,${d})*Z/${size})%1))))`
             }
          var variables = ['X','Y','Z']
          var limits = [[0,size],[0,size],[0,size]]