diff --git a/web/app/sketcher/constr/solver.js b/web/app/sketcher/constr/solver.js
index 69ca96d8..193cead5 100644
--- a/web/app/sketcher/constr/solver.js
+++ b/web/app/sketcher/constr/solver.js
@@ -2,6 +2,10 @@ TCAD.parametric = {};
 
 /** @constructor */
 TCAD.parametric.Param = function(id, value) {
+  this.reset(id, value);
+};
+
+TCAD.parametric.Param.prototype.reset = function(id, value) {
   this.id = id;
   this.value = value;
   this.j = -1;
diff --git a/web/app/sketcher/parametric.js b/web/app/sketcher/parametric.js
index 87f7ac73..b8db19ff 100644
--- a/web/app/sketcher/parametric.js
+++ b/web/app/sketcher/parametric.js
@@ -454,7 +454,14 @@ TCAD.TWO.ParametricManager.prototype.prepareForSubSystem = function(locked, subS
     }
     var _p = pdict[p.id];
     if (_p === undefined) {
-      _p = new TCAD.parametric.Param(p.id, p.get());
+      if (p.__cachedParam__ === undefined) {
+        _p = new TCAD.parametric.Param(p.id, p.get());
+        p.__cachedParam__ = _p;
+      } else {
+        _p = p.__cachedParam__;
+        _p.reset(p.id, p.get());
+      }
+
       _p._backingParam = p;
       pdict[p.id] = _p;
     }