diff --git a/appTools/ToolShell.py b/appTools/ToolShell.py
index 35d9004e..97c94cdc 100644
--- a/appTools/ToolShell.py
+++ b/appTools/ToolShell.py
@@ -292,7 +292,7 @@ class FCShell(TermWidget):
         self.app = app
 
         self.tcl_commands_storage = {}
-	    self.tcl = None
+        self.tcl = None
 
         self.init_tcl()