diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index fa0f7ba7f..71a5c6a9b 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -192,6 +192,9 @@ def checkSqlInjection(place, parameter, value):
             infoMsg = "testing '%s'" % title
             logger.info(infoMsg)
 
+            # Flag used for signaling warning messages regarding unescaping
+            genericWarningFlag = False
+
             # Force back-end DBMS according to the current
             # test value for proper payload unescaping
             Backend.forceDbms(dbms)
@@ -360,12 +363,15 @@ def checkSqlInjection(place, parameter, value):
 
                             configUnion(test.request.char, test.request.columns)
 
-                            if not Backend.getIdentifiedDbms():
+                            if not Backend.getIdentifiedDbms() and not genericWarningFlag:
                                 warnMsg = "using unescaped version of the test "
                                 warnMsg += "because of zero knowledge of the "
                                 warnMsg += "back-end DBMS"
                                 logger.warn(warnMsg)
 
+                                # Set the flag preventing bulking of the message for the same test
+                                genericWarningFlag = True
+
                             # Test for UNION query SQL injection
                             reqPayload, vector = unionTest(comment, place, parameter, value, prefix, suffix)