diff --git a/lemon/glpk.h b/lemon/glpk.h
--- a/lemon/glpk.h
+++ b/lemon/glpk.h
@@ -100,16 +100,20 @@
 
     virtual void _clear();
 
+  private:
+
+    static void freeEnv();
+
+    struct FreeEnvHelper {
+      ~FreeEnvHelper() {
+        freeEnv();
+      }
+    };
+    
+    static FreeEnvHelper freeEnvHelper;
+    
   public:
 
-    /// \brief Deallocates the globally allocated memory of GLPK.
-
-    /// Deallocates the globally allocated memory of GLPK.  \note
-    /// Usually, it do not have to be called, because the GLPK use
-    /// only a small amount of global memory, and it is deallocated
-    /// automatically at the end of program.
-    static void freeEnv();
-
     ///Pointer to the underlying GLPK data structure.
     LPX *lpx() {return lp;}
     ///Const pointer to the underlying GLPK data structure.