diff --git a/script/users/X-Treme users/XPS_Survey_Eph800eV.py b/script/users/X-Treme users/XPS_Survey_Eph800eV.py
index 122857eb..4551fd8c 100644
--- a/script/users/X-Treme users/XPS_Survey_Eph800eV.py	
+++ b/script/users/X-Treme users/XPS_Survey_Eph800eV.py	
@@ -19,7 +19,7 @@ ranges = [ r1 ]
 
 ###################
 
-if abs(ExitSlit.read() - SlitSize ) > 0.1
+if abs(ExitSlit.read() - SlitSize ) > 0.1:
     ExitSlit.write(SlitSize)        # Set Exit Slit
 
 # set mono energy