diff --git a/hurricane/src/hurricane/Interval.cpp b/hurricane/src/hurricane/Interval.cpp
index f7548c4d..27875143 100644
--- a/hurricane/src/hurricane/Interval.cpp
+++ b/hurricane/src/hurricane/Interval.cpp
@@ -140,6 +140,22 @@ Interval& Interval::makeEmpty()
     return *this;
 }
 
+Interval& Interval::shrinkVMin(const DbU::Unit& vMin)
+// **************************************************
+{
+  if ( vMin > _vMin )
+    _vMin = vMin;
+  return *this;
+}
+
+Interval& Interval::shrinkVMax(const DbU::Unit& vMax)
+// **************************************************
+{
+  if ( vMax < _vMax )
+    _vMax = vMax;
+  return *this;
+}
+
 Interval& Interval::inflate(const DbU::Unit& dv)
 // ****************************************
 {
diff --git a/hurricane/src/hurricane/hurricane/Interval.h b/hurricane/src/hurricane/hurricane/Interval.h
index 0f54e532..1e393f36 100644
--- a/hurricane/src/hurricane/hurricane/Interval.h
+++ b/hurricane/src/hurricane/hurricane/Interval.h
@@ -71,6 +71,8 @@ class Interval {
 // ********
 
     public: Interval& makeEmpty();
+    public: Interval& shrinkVMin(const DbU::Unit& vMin);
+    public: Interval& shrinkVMax(const DbU::Unit& vMax);
     public: Interval& inflate(const DbU::Unit& dv);
     public: Interval& inflate(const DbU::Unit& dvMin, const DbU::Unit& dvMax);
     public: Interval& merge(const DbU::Unit& v);