diff --git a/eo/src/es/CMAParams.cpp b/eo/src/es/CMAParams.cpp
index ed575acc..1ded097d 100644
--- a/eo/src/es/CMAParams.cpp
+++ b/eo/src/es/CMAParams.cpp
@@ -53,11 +53,11 @@ using namespace std;
 
 namespace eo {
 
-CMAParams::CMAParams(eoParser& parser, bool requireDimensionality) {
+CMAParams::CMAParams(eoParser& parser, unsigned dimensionality) {
     
     string section = "CMA parameters";
     
-    n = parser.createParam(0, "dimensionality", "Dimensionality (N) of the problem", 'N', section, requireDimensionality).value();
+    n = parser.createParam(dimensionality, "dimensionality", "Dimensionality (N) of the problem", 'N', section, dimensionality == 0).value();
     
     maxgen = parser.createParam(
 	    1000,
diff --git a/eo/src/es/CMAParams.h b/eo/src/es/CMAParams.h
index a5ce5245..f59d6c92 100644
--- a/eo/src/es/CMAParams.h
+++ b/eo/src/es/CMAParams.h
@@ -22,7 +22,7 @@ class CMAParams {
     public:
     
     CMAParams() { /* Call this and all values need to be set by hand */ }
-    CMAParams(eoParser& parser, bool requireDimensionality = true);
+    CMAParams(eoParser& parser, unsigned dimensionality = 0); // 0 dimensionality -> user needs to set it
  
     void defaults(unsigned n_, unsigned maxgen_); /* apply all defaults using n and maxgen */