diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 1359389b1..48b73be99 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -259,7 +259,13 @@ def checkSqlInjection(place, parameter, value):
                 # provided DBMS
                 if conf.dbms is not None and not intersect(payloadDbms, conf.dbms, True):
                     debugMsg = "skipping test '%s' because " % title
-                    debugMsg += "the provided DBMS is %s" % conf.dbms
+                    debugMsg += "it is different than provided"
+                    logger.debug(debugMsg)
+                    continue
+
+                if kb.dbmsFilter is not None and not intersect(payloadDbms, kb.dbmsFilter, True):
+                    debugMsg = "skipping test '%s' because " % title
+                    debugMsg += "it is different than provided"
                     logger.debug(debugMsg)
                     continue
 
@@ -618,7 +624,9 @@ def checkSqlInjection(place, parameter, value):
 
                             configUnion(test.request.char, test.request.columns)
 
-                            if not Backend.getIdentifiedDbms():
+                            if len(kb.dbmsFilter or []) == 1:
+                                Backend.forceDbms(kb.dbmsFilter[0])
+                            elif not Backend.getIdentifiedDbms():
                                 if kb.heuristicDbms is None:
                                     warnMsg = "using unescaped version of the test "
                                     warnMsg += "because of zero knowledge of the "
diff --git a/lib/controller/handler.py b/lib/controller/handler.py
index 1aa418560..f8ea27501 100644
--- a/lib/controller/handler.py
+++ b/lib/controller/handler.py
@@ -82,6 +82,10 @@ def setHandler():
             else:
                 kb.dbms = conf.dbms = conf.forceDbms = dbms
 
+        if kb.dbmsFilter:
+            if dbms not in kb.dbmsFilter:
+                continue
+
         handler = Handler()
         conf.dbmsConnector = Connector()
 
diff --git a/lib/core/option.py b/lib/core/option.py
index 6d341565e..558854a8b 100755
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -1700,7 +1700,13 @@ def _cleanupOptions():
         conf.dbms = conf.forceDbms
 
     if conf.dbms:
-        conf.dbms = conf.dbms.capitalize()
+        kb.dbmsFilter = []
+        for _ in conf.dbms.split(','):
+            for dbms, aliases in DBMS_ALIASES:
+                if _.strip().lower() in aliases:
+                    kb.dbmsFilter.append(dbms)
+                    conf.dbms = dbms if conf.dbms and ',' not in conf.dbms else None
+                    break
 
     if conf.testFilter:
         conf.testFilter = conf.testFilter.strip('*+')
@@ -1905,6 +1911,7 @@ def _setKnowledgeBaseAttributes(flushAll=True):
 
     # Active back-end DBMS fingerprint
     kb.dbms = None
+    kb.dbmsFilter = []
     kb.dbmsVersion = [UNKNOWN_DBMS_VERSION]
 
     kb.delayCandidates = TIME_DELAY_CANDIDATES * [0]
diff --git a/lib/core/settings.py b/lib/core/settings.py
index c12021956..ca6353983 100755
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -19,7 +19,7 @@ from lib.core.enums import DBMS_DIRECTORY_NAME
 from lib.core.enums import OS
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.1.8.14"
+VERSION = "1.1.8.15"
 TYPE = "dev" if VERSION.count('.') > 2 and VERSION.split('.')[-1] != '0' else "stable"
 TYPE_COLORS = {"dev": 33, "stable": 90, "pip": 34}
 VERSION_STRING = "sqlmap/%s#%s" % ('.'.join(VERSION.split('.')[:-1]) if VERSION.count('.') > 2 and VERSION.split('.')[-1] == '0' else VERSION, TYPE)
diff --git a/txt/checksum.md5 b/txt/checksum.md5
index 6f4671e55..0e751d00c 100644
--- a/txt/checksum.md5
+++ b/txt/checksum.md5
@@ -21,9 +21,9 @@ c55b400b72acc43e0e59c87dd8bb8d75  extra/shellcodeexec/windows/shellcodeexec.x32.
 310efc965c862cfbd7b0da5150a5ad36  extra/sqlharvest/__init__.py
 7713aa366c983cdf1f3dbaa7383ea9e1  extra/sqlharvest/sqlharvest.py
 7afe836fd97271ccba67b4c0da2482ff  lib/controller/action.py
-979909f798bfcd346d72089d72234b74  lib/controller/checks.py
+20ec996d592a09f0b4607ddd231586f7  lib/controller/checks.py
 a66093c734c7f94ecdf94d882c2d8b89  lib/controller/controller.py
-76ecef480eef54d4599b8fc44decb639  lib/controller/handler.py
+926bdaf98d082a41fdd57bb41c1692d1  lib/controller/handler.py
 310efc965c862cfbd7b0da5150a5ad36  lib/controller/__init__.py
 ca0a4eba91d73c9d7adedabf528ca4f1  lib/core/agent.py
 6cc95a117fbd34ef31b9aa25520f0e31  lib/core/bigarray.py
@@ -40,13 +40,13 @@ a44d7a4cc6c9a67a72d6af2f25f4ddac  lib/core/exception.py
 310efc965c862cfbd7b0da5150a5ad36  lib/core/__init__.py
 9ba39bf66e9ecd469446bdbbeda906c3  lib/core/log.py
 9d7069d81e4a520ed3fbcac584c1e86e  lib/core/optiondict.py
-106ed715de3e616df28fcc600b724db2  lib/core/option.py
+c5f09788ee8ff9c9d12a052986875bc6  lib/core/option.py
 5f2f56e6c5f274408df61943f1e080c0  lib/core/profiling.py
 40be71cd774662a7b420caeb7051e7d5  lib/core/readlineng.py
 d8e9250f3775119df07e9070eddccd16  lib/core/replication.py
 785f86e3f963fa3798f84286a4e83ff2  lib/core/revision.py
 40c80b28b3a5819b737a5a17d4565ae9  lib/core/session.py
-ba13dfc439f93ae49f8146416bf47f7d  lib/core/settings.py
+35c5e25bc24da66bf3df549e1f1db1ab  lib/core/settings.py
 d91291997d2bd2f6028aaf371bf1d3b6  lib/core/shell.py
 2ad85c130cc5f2b3701ea85c2f6bbf20  lib/core/subprocessng.py
 4a6ecdd8a6e44bb4737bd9bc7f9b5743  lib/core/target.py