diff --git a/src/CommonSOG.h b/src/CommonSOG.h
index d97eed8ef997b1acd222e0159996e75ec17d39b8..c1480c461b27edfb91c657dacd60bbd44d5a79c0 100644
--- a/src/CommonSOG.h
+++ b/src/CommonSOG.h
@@ -7,6 +7,8 @@
 #include "NewNet.h"
 #include <stack>
 class LDDState;
+
+
 typedef pair<LDDState *, MDD> couple;
 typedef pair<couple, Set> Pair;
 typedef stack<Pair> pile;