diff --git a/lib/core/settings.py b/lib/core/settings.py
index 2adf560f7..8b8e8e7a2 100644
--- a/lib/core/settings.py
+++ b/lib/core/settings.py
@@ -20,7 +20,7 @@ from lib.core.enums import OS
 from lib.core.revision import getRevisionNumber
 
 # sqlmap version and site
-VERSION = "1.0.0.18"
+VERSION = "1.0.0.19"
 REVISION = getRevisionNumber()
 STABLE = VERSION.count('.') <= 2
 VERSION_STRING = "sqlmap/%s#%s" % (VERSION, "stable" if STABLE else "dev")
diff --git a/lib/techniques/dns/use.py b/lib/techniques/dns/use.py
index 016dede79..1e4216ef3 100644
--- a/lib/techniques/dns/use.py
+++ b/lib/techniques/dns/use.py
@@ -60,10 +60,11 @@ def dnsUse(payload, expression):
                 prefix, suffix = ("%s" % randomStr(length=3, alphabet=DNS_BOUNDARIES_ALPHABET) for _ in xrange(2))
                 chunk_length = MAX_DNS_LABEL / 2 if Backend.getIdentifiedDbms() in (DBMS.ORACLE, DBMS.MYSQL, DBMS.PGSQL) else MAX_DNS_LABEL / 4 - 2
                 _, _, _, _, _, _, fieldToCastStr, _ = agent.getFields(expression)
+                nulledCastedField = agent.nullAndCastField(fieldToCastStr)
                 extendedField = re.search(r"[^ ,]*%s[^ ,]*" % re.escape(fieldToCastStr), expression).group(0)
                 if extendedField != fieldToCastStr:  # e.g. MIN(surname)
+                    nulledCastedField = extendedField.replace(fieldToCastStr, nulledCastedField)
                     fieldToCastStr = extendedField
-                nulledCastedField = agent.nullAndCastField(fieldToCastStr)
                 nulledCastedField = queries[Backend.getIdentifiedDbms()].substring.query % (nulledCastedField, offset, chunk_length)
                 nulledCastedField = agent.hexConvertField(nulledCastedField)
                 expressionReplaced = expression.replace(fieldToCastStr, nulledCastedField, 1)