diff --git a/django/contrib/gis/geometry/regex.py b/django/contrib/gis/geometry/regex.py
index 1b9e2f46f42..22d16cb4c88 100644
--- a/django/contrib/gis/geometry/regex.py
+++ b/django/contrib/gis/geometry/regex.py
@@ -4,7 +4,7 @@ import re
 # to prevent potentially malicious input from reaching the underlying C
 # library.  Not a substitute for good Web security programming practices.
 hex_regex = re.compile(r'^[0-9A-F]+$', re.I)
-wkt_regex = re.compile(r'^(SRID=(?P<srid>\d+);)?'
+wkt_regex = re.compile(r'^(SRID=(?P<srid>\-?\d+);)?'
                        r'(?P<wkt>'
                        r'(?P<type>POINT|LINESTRING|LINEARRING|POLYGON|MULTIPOINT|MULTILINESTRING|MULTIPOLYGON|GEOMETRYCOLLECTION)'
                        r'[ACEGIMLONPSRUTYZ\d,\.\-\(\) ]+)$',
diff --git a/django/contrib/gis/geos/tests/test_geos.py b/django/contrib/gis/geos/tests/test_geos.py
index f611dd4d1ad..eb13a62cb98 100644
--- a/django/contrib/gis/geos/tests/test_geos.py
+++ b/django/contrib/gis/geos/tests/test_geos.py
@@ -182,13 +182,14 @@ class GEOSTest(unittest.TestCase, TestDataMixin):
 
     def test01h_ewkt(self):
         "Testing EWKT."
-        srid = 32140
-        for p in self.geometries.polygons:
-            ewkt = 'SRID=%d;%s' % (srid, p.wkt)
-            poly = fromstr(ewkt)
-            self.assertEqual(srid, poly.srid)
-            self.assertEqual(srid, poly.shell.srid)
-            self.assertEqual(srid, fromstr(poly.ewkt).srid) # Checking export
+        srids = (-1, 32140)
+        for srid in srids:
+            for p in self.geometries.polygons:
+                ewkt = 'SRID=%d;%s' % (srid, p.wkt)
+                poly = fromstr(ewkt)
+                self.assertEqual(srid, poly.srid)
+                self.assertEqual(srid, poly.shell.srid)
+                self.assertEqual(srid, fromstr(poly.ewkt).srid) # Checking export
 
     def test01i_json(self):
         "Testing GeoJSON input/output (via GDAL)."