diff --git a/django/contrib/gis/oldforms/__init__.py b/django/contrib/gis/oldforms/__init__.py
index 0f3f33c78e..94ef9acc1f 100644
--- a/django/contrib/gis/oldforms/__init__.py
+++ b/django/contrib/gis/oldforms/__init__.py
@@ -1,14 +1,29 @@
+from django.core.validators import ValidationError
 from django.oldforms import LargeTextField
+from django.contrib.gis.geos import GEOSException, GEOSGeometry
 
 class WKTField(LargeTextField):
     "An oldforms LargeTextField for editing WKT text in the admin."
-    
+    def __init__(self, *args, **kwargs):
+        super(WKTField, self).__init__(*args, **kwargs)
+        # Overridding the validator list.
+        self.validator_list = [self.isValidGeom]
+
     def render(self, data):
         # Returns the WKT value for the geometry field.  When no such data
         #  is present, return None to LargeTextField's render.
-        if not data:
-            return super(WKTField, self).render(None)
-        else:
+        if isinstance(data, GEOSGeometry):
             return super(WKTField, self).render(data.wkt)
+        elif isinstance(data, basestring):
+            return super(WKTField, self).render(data)
+        else:
+            return super(WKTField, self).render(None)
+
+    def isValidGeom(self, field_data, all_data):
+        try:
+            g = GEOSGeometry(field_data)
+        except GEOSException:
+            raise ValidationError('Valid WKT or HEXEWKB is required for Geometry Fields.')
+