diff --git a/lib/controller/checks.py b/lib/controller/checks.py
index 958c9e694..88da289d7 100644
--- a/lib/controller/checks.py
+++ b/lib/controller/checks.py
@@ -302,10 +302,12 @@ def checkSqlInjection(place, parameter, value):
                         # Use different page template than the original
                         # one as we are changing parameters value, which
                         # will likely result in a different content
-                        if not conf.logicalNegate:
-                            origValue = "-%s" % randomInt()
-                        else:
+                        if conf.invalidLogical:
                             origValue = "%s AND %s=%s" % (origValue, randomInt(), randomInt())
+                        elif conf.invalidBignum:
+                            origValue = "%d.%d" % (randomInt(6), randomInt(1))
+                        else:
+                            origValue = "-%s" % randomInt()
                         templatePayload = agent.payload(place, parameter, newValue=origValue, where=where)
                     elif where == PAYLOAD.WHERE.REPLACE:
                         origValue = ""
diff --git a/lib/core/agent.py b/lib/core/agent.py
index 210b7fba0..699ef9afb 100644
--- a/lib/core/agent.py
+++ b/lib/core/agent.py
@@ -87,15 +87,17 @@ class Agent:
             if where == PAYLOAD.WHERE.ORIGINAL:
                 value = origValue
             elif where == PAYLOAD.WHERE.NEGATIVE:
-                if not conf.logicalNegate:
+                if conf.invalidLogical:
+                    match = re.search(r'\A[^ ]+', newValue)
+                    newValue = newValue[len(match.group() if match else ""):]
+                    value = "%s%s AND %s=%s" % (origValue, match.group() if match else "", randomInt(2), randomInt(2))
+                elif conf.invalidBignum:
+                    value = "%d.%d" % (randomInt(6), randomInt(1))
+                else:
                     if newValue.startswith("-"):
                         value = ""
                     else:
                         value = "-%s" % randomInt()
-                else:
-                    match = re.search(r'\A[^ ]+', newValue)
-                    newValue = newValue[len(match.group() if match else ""):]
-                    value = "%s%s AND %s=%s" % (origValue, match.group() if match else "", randomInt(2), randomInt(2))
             elif where == PAYLOAD.WHERE.REPLACE:
                 value = ""
             else:
diff --git a/lib/core/optiondict.py b/lib/core/optiondict.py
index c47d84e78..d823f6a6d 100644
--- a/lib/core/optiondict.py
+++ b/lib/core/optiondict.py
@@ -63,9 +63,10 @@ optDict = {
                                "testParameter":     "string",
                                "dbms":              "string",
                                "os":                "string",
+                               "invalidBignum":     "boolean",
+                               "invalidLogical":     "boolean",
                                "prefix":            "string",
                                "suffix":            "string",
-                               "logicalNegate":     "boolean",
                                "skip":              "string",
                                "tamper":            "string"
                              },
diff --git a/lib/parse/cmdline.py b/lib/parse/cmdline.py
index d8b31a00f..8d61604f3 100644
--- a/lib/parse/cmdline.py
+++ b/lib/parse/cmdline.py
@@ -190,20 +190,24 @@ def cmdLineParser():
                              help="Force back-end DBMS operating system "
                                   "to this value")
 
+        injection.add_option("--invalid-bignum", dest="invalidBignum",
+                             action="store_true",
+                             help="Use big numbers for invalidating values")
+
+        injection.add_option("--invalid-logical", dest="invalidLogical",
+                             action="store_true",
+                             help="Use logical operations for invalidating values")
+
+        injection.add_option("--no-cast", dest="noCast",
+                             action="store_true",
+                             help="Turn off payload casting mechanism")
+
         injection.add_option("--prefix", dest="prefix",
                              help="Injection payload prefix string")
 
         injection.add_option("--suffix", dest="suffix",
                              help="Injection payload suffix string")
 
-        injection.add_option("--logical-negate", dest="logicalNegate",
-                             action="store_true",
-                             help="Use logic operation(s) for negating values")
-
-        injection.add_option("--no-cast", dest="noCast",
-                             action="store_true",
-                             help="Turn off payload casting mechanism")
-
         injection.add_option("--skip", dest="skip",
                              help="Skip testing for given parameter(s)")
 
diff --git a/sqlmap.conf b/sqlmap.conf
index 58c9f4b07..9093cf887 100644
--- a/sqlmap.conf
+++ b/sqlmap.conf
@@ -191,20 +191,24 @@ dbms =
 # Valid: linux, windows
 os = 
 
+# Use big numbers for invalidating values.
+# Valid: True or False
+invalidBignum = False
+
+# Use logical operations for invalidating values.
+# Valid: True or False
+invalidLogical = False
+
+# Turn off payload casting mechanism
+# Valid: True or False
+noCast = False
+
 # Injection payload prefix string.
 prefix = 
 
 # Injection payload suffix string.
 suffix = 
 
-# Use logic operation(s) for negating values.
-# Valid: True or False
-logicalNegate = False
-
-# Turn off payload casting mechanism
-# Valid: True or False
-noCast = False
-
 # Skip testing for given parameter(s).
 skip =