diff --git a/dpdb/problems/vertexcover.py b/dpdb/problems/vertexcover.py
index 89c0008..9a0d5ce 100644
--- a/dpdb/problems/vertexcover.py
+++ b/dpdb/problems/vertexcover.py
@@ -57,7 +57,6 @@ def filter(self, node):
 
         for edge in nv:
             check.append(" OR ".join(map(var2col, edge)))
-
         if check:
             return "WHERE ({})".format(") AND (".join(check))
         else: