diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 69aa96e6c..3e4698c5c 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -817,6 +817,8 @@ def heuristicCheckDbms(injection):
         infoMsg += "could be '%s' " % retVal
         logger.info(infoMsg)
 
+        kb.heuristicExtendedDbms = retVal
+
     return retVal
 
 def checkFalsePositives(injection):
diff --git a/lib/controller/handler.py b/lib/controller/handler.py
index 1234478e9..98f4dab40 100644
--- a/lib/controller/handler.py
+++ b/lib/controller/handler.py
@@ -70,7 +70,7 @@ def setHandler():
                   (DBMS.INFORMIX, INFORMIX_ALIASES, InformixMap, InformixConn),
             ]
 
-    _ = max(_ if (Backend.getIdentifiedDbms() or "").lower() in _[1] else None for _ in items)
+    _ = max(_ if (Backend.getIdentifiedDbms() or kb.heuristicExtendedDbms or "").lower() in _[1] else None for _ in items)
     if _:
         items.remove(_)
         items.insert(0, _)
diff --git a/lib/core/option.py b/lib/core/option.py
index 6edf99628..cb51ee479 100755
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -1922,6 +1922,7 @@ def _setKnowledgeBaseAttributes(flushAll=True):
     kb.futileUnion = None
     kb.headersFp = {}
     kb.heuristicDbms = None
+    kb.heuristicExtendedDbms = None
     kb.heuristicMode = False
     kb.heuristicPage = False
     kb.heuristicTest = None
diff --git a/lib/core/settings.py b/lib/core/settings.py
index bb31b7ff4..407a1501d 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 = "1.1.6.3"
+VERSION = "1.1.6.4"
 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 21d108250..cf69c73ad 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
-cc6623fc0a9790818317653b9463a96d  lib/controller/checks.py
+f77daa397016460433d5e06704efd538  lib/controller/checks.py
 130d1c16708668b8d89605b6b5b38bf5  lib/controller/controller.py
-52a3969f57170e935e3fc0156335bf2c  lib/controller/handler.py
+a97df93b552ee4e4ba3692eae870de7c  lib/controller/handler.py
 310efc965c862cfbd7b0da5150a5ad36  lib/controller/__init__.py
 d58e85ffeac2471ef3af729076b3b5f7  lib/core/agent.py
 6cc95a117fbd34ef31b9aa25520f0e31  lib/core/bigarray.py
@@ -40,13 +40,13 @@ b9ff4e622c416116bee6024c0f050349  lib/core/enums.py
 310efc965c862cfbd7b0da5150a5ad36  lib/core/__init__.py
 9ba39bf66e9ecd469446bdbbeda906c3  lib/core/log.py
 edcfce0850771e6454acef244d5c5760  lib/core/optiondict.py
-9eb46811650036aac410b3dde20a86f4  lib/core/option.py
+a09c6ceee8dbb624cc3ca1d17749c8a5  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
-7dae5446f2587e632536d540c3950848  lib/core/settings.py
+6e7731aa5bc04ef76a597c91e0701665  lib/core/settings.py
 d91291997d2bd2f6028aaf371bf1d3b6  lib/core/shell.py
 2ad85c130cc5f2b3701ea85c2f6bbf20  lib/core/subprocessng.py
 8136241fdbdb99a5dc0e51ba72918f6e  lib/core/target.py