diff --git a/eo/src/eoFlOrMonOp.h b/eo/src/eoFlOrMonOp.h
index 982dc7e8..4b56cb51 100644
--- a/eo/src/eoFlOrMonOp.h
+++ b/eo/src/eoFlOrMonOp.h
@@ -65,12 +65,9 @@ public :
   }
 
   /** inherited className() */
-  virtual string className() const 
+  virtual std::string className() const 
   { 
-    char s[1024];
-    ostrstream os(s, 1022);
-    os << "eoFlOrAllMutation(" << atomMutation.className() << ")"; 
-    return string(s); 
+    return "eoFlOrAllMutation(" + atomMutation.className() + ")";
   }
 
 private:
@@ -107,12 +104,9 @@ public :
   }
 
   /** inherited className() */
-  virtual string className() const
+  virtual std::string className() const
   { 
-    char s[1024];
-    ostrstream os(s, 1022);
-    os << "eoFlOrKMutation(" << atomMutation.className() << ")" << ends; 
-    return string(s); 
+    return "eoFlOrKMutation(" + atomMutation.className() + ")";
   }
 
 private:
diff --git a/eo/src/eoVariableLengthCrossover.h b/eo/src/eoVariableLengthCrossover.h
index f2a38932..5e0b1653 100644
--- a/eo/src/eoVariableLengthCrossover.h
+++ b/eo/src/eoVariableLengthCrossover.h
@@ -26,8 +26,6 @@
 #ifndef _eoVariableLengthCrossover_h
 #define _eoVariableLengthCrossover_h
 
-#include <config.h>
-
 #include <eoFunctor.h>
 #include <eoOp.h>
 
@@ -204,11 +202,9 @@ public :
 
   virtual std::string className() const
   { 
-    char s[1024];
-    std::ostrstream os(s, 1022);
-    os << "eoInnerExchangeQuadOp(" << atomExchange.className() << ")" << std::ends; 
-    return std::string(s); 
+    return "eoInnerExchangeQuadOp(" + op.className() + ")";
   }
+
 private:
   float rate;
   eoQuadOp<AtomType> & op;