diff --git a/eo/src/es/eoEsChromInit.h b/eo/src/es/eoEsChromInit.h
index 872fc8ed..e9485d2b 100644
--- a/eo/src/es/eoEsChromInit.h
+++ b/eo/src/es/eoEsChromInit.h
@@ -64,7 +64,8 @@ public :
 
     EOT operator()()
     {
-        return create(EOT());
+        EOT eo;
+        return create(eo);
     }
 
 private :
diff --git a/eo/src/es/eoEsMutate.h b/eo/src/es/eoEsMutate.h
index 0a613842..ce76bfe1 100644
--- a/eo/src/es/eoEsMutate.h
+++ b/eo/src/es/eoEsMutate.h
@@ -65,7 +65,7 @@ template <class EOT>
 class eoEsMutate: public eoMonOp< EOT > {
 public:
 
-    typedef EOT::Fitness FitT;
+    typedef typename EOT::Fitness FitT;
 
     /** Initialization
         parameters:
@@ -156,7 +156,8 @@ public:
      */
     
     double global = exp(TauGlb * rng.normal());
-    for (unsigned i = 0; i < _eo.size(); i++) 
+    unsigned i;
+    for (i = 0; i < _eo.size(); i++) 
     {
 	    double stdev = _eo.stdevs[i];
 	    stdev *= global * exp(TauLcl * rng.normal());	
@@ -230,14 +231,14 @@ public:
 
   private :
 
-    void init(eoEsSimple<FitT>&, eoEsMutationInit& _init)
+    void init(eoEsSimple<FitT>, eoEsMutationInit& _init)
     {
         unsigned size = bounds.chromSize();
         TauLcl = _init.TauLcl();
         TauLcl /= sqrt((double) size);
     }
 
-    void init(eoEsStdev<FitT>&, eoEsMutationInit& _init)
+    void init(eoEsStdev<FitT>, eoEsMutationInit& _init)
     {
         unsigned size = bounds.chromSize();
 
@@ -249,7 +250,7 @@ public:
 	    TauGlb /= sqrt( 2.0 * ( (double) size ) );
     }
     
-    void init(eoEsFull<FitT>&, eoEsMutationInit& _init)
+    void init(eoEsFull<FitT>, eoEsMutationInit& _init)
     {
         init(eoEsStdev<FitT>(), _init);
         TauBeta = _init.TauBeta();