diff --git a/ExtraTypes.cpp b/ExtraTypes.cpp
index eb054d612a24231318d4c16d3a1d9d512cc1ab07..d2dccfc019d076ffb98662248ff18643ab1c57a4 100644
--- a/ExtraTypes.cpp
+++ b/ExtraTypes.cpp
@@ -104,7 +104,7 @@ inline void hashCombine ( std::size_t & o_seed , const _T & p_val)
  o_seed ^= std :: hash <_T >() (p_val) + 0x9e3779b9 + (o_seed << 6) + (o_seed >> 2) ;
 }
 
-size_t hash_u_set<s>::operator()(const s &x) const{
+size_t hash_u_set<s>::operator()(const s &x) const{ 
     std :: size_t seed = 0;
     int a[] = {x.f_id, x.l_id, x.c_id};
     if(a[0] > a[1])