diff --git a/src/tools/RMSD.cpp b/src/tools/RMSD.cpp
index bf90fe1eda99382c5b59cf15f3d16ecaef212108..1b7fbe06b8fe7fec7979c85622cba42e6fe9d4a8 100644
--- a/src/tools/RMSD.cpp
+++ b/src/tools/RMSD.cpp
@@ -335,7 +335,7 @@ double RMSD::simpleAlignment(const  std::vector<double>  & align,
 
 // this below enable the standard case for rmsd where the rmsd is calculated and the derivative of rmsd respect to positions is retrieved
 // additionally this assumes that the com of the reference is already subtracted.    
-//#define OLDRMSD
+#define OLDRMSD
 #ifdef OLDRMSD
 // notice that in the current implementation the safe argument only makes sense for
 // align==displace