diff --git a/lib/controller/controller.py b/lib/controller/controller.py
index 183ad45f0..aecb75b00 100644
--- a/lib/controller/controller.py
+++ b/lib/controller/controller.py
@@ -209,8 +209,6 @@ def start():
                     checkStability()
 
                 for place in conf.parameters.keys():
-                    conf.matchRatio = None
-
                     if not conf.paramDict.has_key(place):
                         continue
 
@@ -250,6 +248,8 @@ def start():
                                 logMsg += "%d parenthesis" % parenthesis
                                 logger.info(logMsg)
 
+                                conf.matchRatio = None
+
                                 injType = checkSqlInjection(place, parameter, value, parenthesis)
 
                                 if injType: