diff --git a/eo/test/real_value.h b/eo/test/real_value.h
index 8f3a0df5..8bedd6b9 100644
--- a/eo/test/real_value.h
+++ b/eo/test/real_value.h
@@ -12,7 +12,7 @@ double real_value(const std::vector<double>& _ind)
   double sum = 0;
   for (unsigned i = 0; i < _ind.size(); i++)
       sum += _ind[i] * _ind[i];
-  return sqrt(sum);
+  return sum/_ind.size();
 }
 
 
diff --git a/eo/test/t-eoESAll.cpp b/eo/test/t-eoESAll.cpp
index f673eaf7..adf2aace 100644
--- a/eo/test/t-eoESAll.cpp
+++ b/eo/test/t-eoESAll.cpp
@@ -2,7 +2,7 @@
 
 #ifdef _MSC_VER
 #pragma warning(disable:4786)
-#endif 
+#endif
 
 #include <algorithm>
 #include <string>