diff --git a/src/Extrema/Extrema_GenExtCS.cxx b/src/Extrema/Extrema_GenExtCS.cxx
index fa17ce9503..c6a8f5089b 100644
--- a/src/Extrema/Extrema_GenExtCS.cxx
+++ b/src/Extrema/Extrema_GenExtCS.cxx
@@ -120,6 +120,15 @@ Extrema_GenExtCS::Extrema_GenExtCS()
 {
 }
 
+// =======================================================================
+// function : ~Extrema_GenExtCS
+// purpose  :
+// =======================================================================
+Extrema_GenExtCS::~Extrema_GenExtCS()
+{
+  //
+}
+
 //=======================================================================
 //function : Extrema_GenExtCS
 //purpose  : 
diff --git a/src/Extrema/Extrema_GenExtCS.hxx b/src/Extrema/Extrema_GenExtCS.hxx
index 6b141077d2..cd460ba7f2 100644
--- a/src/Extrema/Extrema_GenExtCS.hxx
+++ b/src/Extrema/Extrema_GenExtCS.hxx
@@ -35,9 +35,12 @@ public:
 
   DEFINE_STANDARD_ALLOC
 
-  
+  //! Empty constructor.
   Standard_EXPORT Extrema_GenExtCS();
-  
+
+  //! Destructor.
+  Standard_EXPORT ~Extrema_GenExtCS();
+
   //! It calculates all the distances.
   //! The function F(u,v)=distance(S1(u1,v1),S2(u2,v2)) has an
   //! extremum when gradient(F)=0. The algorithm searches
diff --git a/src/Extrema/Extrema_GenExtPS.cxx b/src/Extrema/Extrema_GenExtPS.cxx
index 0f9e57da57..3770bb1b64 100644
--- a/src/Extrema/Extrema_GenExtPS.cxx
+++ b/src/Extrema/Extrema_GenExtPS.cxx
@@ -224,7 +224,19 @@ Extrema_GenExtPS::Extrema_GenExtPS()
   myAlgo = Extrema_ExtAlgo_Grad;
 }
 
+// =======================================================================
+// function : ~Extrema_GenExtPS
+// purpose  :
+// =======================================================================
+Extrema_GenExtPS::~Extrema_GenExtPS()
+{
+  //
+}
 
+// =======================================================================
+// function : Extrema_GenExtPS
+// purpose  :
+// =======================================================================
 Extrema_GenExtPS::Extrema_GenExtPS (const gp_Pnt&          P,
                                     const Adaptor3d_Surface& S,
                                     const Standard_Integer NbU, 
diff --git a/src/Extrema/Extrema_GenExtPS.hxx b/src/Extrema/Extrema_GenExtPS.hxx
index fc14c4874d..61d3b8c769 100644
--- a/src/Extrema/Extrema_GenExtPS.hxx
+++ b/src/Extrema/Extrema_GenExtPS.hxx
@@ -37,8 +37,12 @@ public:
 
   DEFINE_STANDARD_ALLOC
 
+  //! Empty constructor.
   Standard_EXPORT Extrema_GenExtPS();
-  
+
+  //! Destructor.
+  Standard_EXPORT ~Extrema_GenExtPS();
+
   //! It calculates all the distances.
   //! The function F(u,v)=distance(P,S(u,v)) has an
   //! extremum when gradient(F)=0. The algorithm searches
diff --git a/src/Extrema/Extrema_GenExtSS.cxx b/src/Extrema/Extrema_GenExtSS.cxx
index e8ec2a8e04..b56eca7397 100644
--- a/src/Extrema/Extrema_GenExtSS.cxx
+++ b/src/Extrema/Extrema_GenExtSS.cxx
@@ -118,6 +118,15 @@ Extrema_GenExtSS::Extrema_GenExtSS()
   myInit = Standard_False;
 }
 
+// =======================================================================
+// function : ~Extrema_GenExtSS
+// purpose  :
+// =======================================================================
+Extrema_GenExtSS::~Extrema_GenExtSS()
+{
+  //
+}
+
 //=======================================================================
 //function : Extrema_GenExtSS
 //purpose  : 
diff --git a/src/Extrema/Extrema_GenExtSS.hxx b/src/Extrema/Extrema_GenExtSS.hxx
index c8fb24a06a..d02f5c2575 100644
--- a/src/Extrema/Extrema_GenExtSS.hxx
+++ b/src/Extrema/Extrema_GenExtSS.hxx
@@ -36,9 +36,12 @@ public:
 
   DEFINE_STANDARD_ALLOC
 
-  
+  //! Empty constructor.
   Standard_EXPORT Extrema_GenExtSS();
-  
+
+  //! Destructor.
+  Standard_EXPORT ~Extrema_GenExtSS();
+
   //! It calculates all the distances.
   //! The function F(u,v)=distance(S1(u1,v1),S2(u2,v2)) has an
   //! extremum when gradient(F)=0. The algorithm searches