diff --git a/include/dynamic-graph/value.h b/include/dynamic-graph/value.h
index 5630552a50036c2972c891235b981fb1722365f8..aee37bf3acba95b39aac8a1aede7fa1c89b423c4 100644
--- a/include/dynamic-graph/value.h
+++ b/include/dynamic-graph/value.h
@@ -114,6 +114,14 @@ namespace dynamicgraph {
 	static const Value::Type TypeID;
       };
 
+    template<> const Value::Type ValueHelper<bool>::TypeID = Value::BOOL;
+    template<> const Value::Type ValueHelper<unsigned>::TypeID = Value::UNSIGNED;
+    template<> const Value::Type ValueHelper<int>::TypeID = Value::INT;
+    template<> const Value::Type ValueHelper<float>::TypeID = Value::FLOAT;
+    template<> const Value::Type ValueHelper<double>::TypeID = Value::DOUBLE;
+    template<> const Value::Type ValueHelper<std::string>::TypeID = Value::STRING;
+    template<> const Value::Type ValueHelper<Vector>::TypeID = Value::VECTOR;
+    template<> const Value::Type ValueHelper<Matrix>::TypeID = Value::MATRIX;
   } // namespace command
 } //namespace dynamicgraph
 
diff --git a/src/command/value.cpp b/src/command/value.cpp
index 677a317c238f5821d32f9dea3c77d494c18c13de..08d273b92ccd237c61c28b8e656932efd6f534d9 100644
--- a/src/command/value.cpp
+++ b/src/command/value.cpp
@@ -322,16 +322,5 @@ namespace dynamicgraph {
       }
       return os;
     }
-
-    /* ---- HELPER ---------------------------------------------------------- */
-    template<> const Value::Type ValueHelper<bool>::TypeID = Value::BOOL;
-    template<> const Value::Type ValueHelper<unsigned>::TypeID = Value::UNSIGNED;
-    template<> const Value::Type ValueHelper<int>::TypeID = Value::INT;
-    template<> const Value::Type ValueHelper<float>::TypeID = Value::FLOAT;
-    template<> const Value::Type ValueHelper<double>::TypeID = Value::DOUBLE;
-    template<> const Value::Type ValueHelper<std::string>::TypeID = Value::STRING;
-    template<> const Value::Type ValueHelper<Vector>::TypeID = Value::VECTOR;
-    template<> const Value::Type ValueHelper<Matrix>::TypeID = Value::MATRIX;
-
   } // namespace command
 } //namespace dynamicgraph