diff --git a/ropgadget/core.py b/ropgadget/core.py
index 6669aba..9b25424 100644
--- a/ropgadget/core.py
+++ b/ropgadget/core.py
@@ -375,10 +375,10 @@ class Core(cmd.Cmd):
 
     def do_only(self, s, silent=False):
         try:
-	if s == "None":
-		self.__options.only = None
-	else:
-		self.__options.only = s.split()[0]
+            if s == "None":
+                self.__options.only = None
+            else:
+                self.__options.only = s.split()[0]
         except:
             if not silent:
                 return self.help_only()