diff --git a/django/contrib/gis/forms/fields.py b/django/contrib/gis/forms/fields.py
index 59e7259..b76de72 100644
--- a/django/contrib/gis/forms/fields.py
+++ b/django/contrib/gis/forms/fields.py
@@ -48,7 +48,7 @@ class GeometryField(forms.Field):
         if value in self.empty_values:
             return None
         try:
-            return GEOSGeometry(value)
+            return GEOSGeometry(value, self.widget.map_srid)
         except (GEOSException, ValueError, TypeError):
             raise forms.ValidationError(self.error_messages['invalid_geom'], code='invalid_geom')
 
@@ -92,7 +92,7 @@ class GeometryField(forms.Field):
 
         # Only do a geographic comparison if both values are available
         if initial and data:
-            data = fromstr(data)
+            data = fromstr(data, self.widget.map_srid)
             data.transform(initial.srid)
             # If the initial value was not added by the browser, the geometry
             # provided may be slightly different, the first time it is saved.
diff --git a/django/contrib/gis/forms/widgets.py b/django/contrib/gis/forms/widgets.py
index 0102ab6..b6f5f92 100644
--- a/django/contrib/gis/forms/widgets.py
+++ b/django/contrib/gis/forms/widgets.py
@@ -39,7 +39,7 @@ class BaseGeometryWidget(Widget):
 
     def deserialize(self, value):
         try:
-            return GEOSGeometry(value)
+            return GEOSGeometry(value, self.map_srid)
         except (GEOSException, ValueError) as err:
             logger.error(
                 "Error creating geometry from value '%s' (%s)" % (