diff --git a/plugin/jedi_vim.py b/plugin/jedi_vim.py
index a9c2fca..5f88a3e 100644
--- a/plugin/jedi_vim.py
+++ b/plugin/jedi_vim.py
@@ -200,7 +200,8 @@ def show_func_def(call_def=None, completion_lines=0):
         return
     try:
         if call_def == None:
-            call_def = get_script().get_in_function_call()
+            sig = get_script().call_signatures()
+            call_def = sig[0] if sig else None
         clear_func_def()
 
         if call_def is None: