diff --git a/script/rock.py b/script/rock.py
index b401f31..68444a3 100644
--- a/script/rock.py
+++ b/script/rock.py
@@ -41,9 +41,9 @@ def rock(axis = th1, ffail = False, tt = 0.2, seti0 = False, dx = None, noref =
     
 
     if seti0 and not ffail:
-	    time.sleep(2)
+        time.sleep(2)
         run("setI0")
-
+        
     #add after_rock BPM1:SUM as reference for monitoring monochromator thermal drift
     if (noref==False) and not ffail:
         time.sleep(3) # wait a bit until mono theta finish moving