diff --git a/lib/core/common.py b/lib/core/common.py
index ca9dd97f1..ac453a046 100755
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -917,7 +917,7 @@ def readInput(message, default=None, checkBatch=True):
 
     return retVal
 
-def randomRange(start=0, stop=1000):
+def randomRange(start=0, stop=1000, seed=None):
     """
     Returns random integer value in given range
 
@@ -926,9 +926,11 @@ def randomRange(start=0, stop=1000):
     423
     """
 
-    return int(random.randint(start, stop))
+    randint = random.WichmannHill(seed).randint if seed is not None else random.randint
 
-def randomInt(length=4):
+    return int(randint(start, stop))
+
+def randomInt(length=4, seed=None):
     """
     Returns random integer value with provided number of digits
 
@@ -937,9 +939,11 @@ def randomInt(length=4):
     874254
     """
 
-    return int("".join(random.choice(string.digits if _ != 0 else string.digits.replace('0', '')) for _ in xrange(0, length)))
+    choice = random.WichmannHill(seed).choice if seed is not None else random.choice
 
-def randomStr(length=4, lowercase=False, alphabet=None):
+    return int("".join(choice(string.digits if _ != 0 else string.digits.replace('0', '')) for _ in xrange(0, length)))
+
+def randomStr(length=4, lowercase=False, alphabet=None, seed=None):
     """
     Returns random string value with provided number of characters
 
@@ -948,12 +952,14 @@ def randomStr(length=4, lowercase=False, alphabet=None):
     'RNvnAv'
     """
 
+    choice = random.WichmannHill(seed).choice if seed is not None else random.choice
+
     if alphabet:
-        retVal = "".join(random.choice(alphabet) for _ in xrange(0, length))
+        retVal = "".join(choice(alphabet) for _ in xrange(0, length))
     elif lowercase:
-        retVal = "".join(random.choice(string.ascii_lowercase) for _ in xrange(0, length))
+        retVal = "".join(choice(string.ascii_lowercase) for _ in xrange(0, length))
     else:
-        retVal = "".join(random.choice(string.ascii_letters) for _ in xrange(0, length))
+        retVal = "".join(choice(string.ascii_letters) for _ in xrange(0, length))
 
     return retVal
 
diff --git a/lib/request/inject.py b/lib/request/inject.py
index 11645e44d..c8bdf5db5 100644
--- a/lib/request/inject.py
+++ b/lib/request/inject.py
@@ -83,7 +83,7 @@ def _goInference(payload, expression, charsetType=None, firstChar=None, lastChar
                 expression = "SELECT %s FROM (%s)" % (field, expression)
 
                 if Backend.getIdentifiedDbms() in (DBMS.MYSQL, DBMS.PGSQL):
-                    expression += " AS %s" % randomStr(lowercase=True)
+                    expression += " AS %s" % randomStr(lowercase=True, seed=hash(expression))
 
             if field and conf.hexConvert or conf.binaryFields and field in conf.binaryFields.split(','):
                 nulledCastedField = agent.nullAndCastField(field)