diff --git a/slither/core/cfg/node.py b/slither/core/cfg/node.py
index 7b15937e7..855871684 100644
--- a/slither/core/cfg/node.py
+++ b/slither/core/cfg/node.py
@@ -685,6 +685,8 @@ class Node(SourceMapping, ChildFunction):
             elif isinstance(ir, (HighLevelCall)) and not isinstance(ir, LibraryCall):
                 if isinstance(ir.destination.type, Contract):
                     self._high_level_calls.append((ir.destination.type, ir.function))
+                elif ir.destination == SolidityVariable('this'):
+                    self._high_level_calls.append((self.function.contract, ir.function))
                 else:
                     self._high_level_calls.append((ir.destination.type.type, ir.function))
             elif isinstance(ir, LibraryCall):
diff --git a/slither/printers/call/call_graph.py b/slither/printers/call/call_graph.py
index a68b7de49..ed5efdfae 100644
--- a/slither/printers/call/call_graph.py
+++ b/slither/printers/call/call_graph.py
@@ -142,6 +142,9 @@ class PrinterCallGraph(AbstractPrinter):
             Args:
                 filename(string)
         """
+        if not filename:
+            filename = "contracts.dot"
+
         if not filename.endswith('.dot'):
             filename += '.dot'
 
diff --git a/slither/printers/inheritance/inheritance_graph.py b/slither/printers/inheritance/inheritance_graph.py
index 9897db4b2..468969002 100644
--- a/slither/printers/inheritance/inheritance_graph.py
+++ b/slither/printers/inheritance/inheritance_graph.py
@@ -171,7 +171,7 @@ class PrinterInheritanceGraph(AbstractPrinter):
                 filename(string)
         """
         if filename == '':
-            filename = 'export'
+            filename = 'contracts.dot'
         if not filename.endswith('.dot'):
             filename += ".dot"
         info = 'Inheritance Graph: ' + filename