diff --git a/include/sot/core/derivator-impl.hh b/include/sot/core/derivator-impl.hh
index a235a7e9d33b2a3db9281c680d9ed47f2cf44e11..f440ce1215176edb4b186280ed58b10437f72620 100644
--- a/include/sot/core/derivator-impl.hh
+++ b/include/sot/core/derivator-impl.hh
@@ -53,8 +53,8 @@ namespace dg = dynamicgraph;
    className( const std::string& name );                            \
    };
 #else
-# define DECLARE_SPECIFICATION(, sotSigType) \
-   typedef Derivator<sotSigType,sotCoefType> className;
+# define DECLARE_SPECIFICATION(className, sotSigType) \
+   typedef Derivator<sotSigType> className;
 #endif
 
 DECLARE_SPECIFICATION(DerivatorDouble,double)