diff --git a/CHANGES.current b/CHANGES.current
index 565a4ec0f..fe11a2952 100644
--- a/CHANGES.current
+++ b/CHANGES.current
@@ -5,6 +5,11 @@ See the RELEASENOTES file for a summary of changes in each release.
 Version 2.0.10 (in progress)
 ============================
 
+2013-05-25: wsfulton
+            [Python] Fix Python 3 inconsistency when negative numbers are passed
+            where a parameter expects an unsigned C type. An OverFlow error is
+            now consistently thrown instead of a TypeError.
+
 2013-05-25: Artem Serebriyskiy
             SVN Patch ticket #338 - fixes to %attribute macros for template usage
             with %arg.
diff --git a/Examples/test-suite/python/primitive_types_runme.py b/Examples/test-suite/python/primitive_types_runme.py
index 2495cd60d..be8d38bad 100644
--- a/Examples/test-suite/python/primitive_types_runme.py
+++ b/Examples/test-suite/python/primitive_types_runme.py
@@ -275,10 +275,22 @@ try:
 except TypeError:
   if a != t.var_char:
     error = 1
-  pass 
+  pass
 if error:
   raise RuntimeError, "bad char typemap"
 
+try:
+  error = 0
+  a = t.var_ushort
+  t.var_ushort = -1
+  error = 1
+except OverflowError:
+  if a != t.var_ushort:
+    error = 1
+  pass
+if error:
+  raise RuntimeError, "bad ushort typemap"
+
 try:
   error = 0
   a = t.var_uint
@@ -287,10 +299,34 @@ try:
 except OverflowError:
   if a != t.var_uint:
     error = 1
-  pass 
+  pass
 if error:
   raise RuntimeError, "bad uint typemap"
 
+try:
+  error = 0
+  a = t.var_sizet
+  t.var_sizet = -1
+  error = 1
+except OverflowError:
+  if a != t.var_sizet:
+    error = 1
+  pass
+if error:
+  raise RuntimeError, "bad sizet typemap"
+
+try:
+  error = 0
+  a = t.var_ulong
+  t.var_ulong = -1
+  error = 1
+except OverflowError:
+  if a != t.var_ulong:
+    error = 1
+  pass
+if error:
+  raise RuntimeError, "bad ulong typemap"
+
 #
 #
 try:
@@ -301,7 +337,7 @@ try:
 except TypeError:
   if a != t.var_namet:
     error = 1
-  pass 
+  pass
 if error:
   raise RuntimeError, "bad namet typemap"
 
diff --git a/Lib/python/pyprimtypes.swg b/Lib/python/pyprimtypes.swg
index 3fbd86a21..66ff104a6 100644
--- a/Lib/python/pyprimtypes.swg
+++ b/Lib/python/pyprimtypes.swg
@@ -127,6 +127,18 @@ SWIG_AsVal_dec(unsigned long)(PyObject *obj, unsigned long *val)
       return SWIG_OK;
     } else {
       PyErr_Clear();
+%#if PY_VERSION_HEX >= 0x03000000
+      {
+        long v = PyLong_AsLong(obj);
+        if (!PyErr_Occurred()) {
+          if (v < 0) {
+            return SWIG_OverflowError;
+          }
+        } else {
+          PyErr_Clear();
+        }
+      }
+%#endif
     }
   }
 %#ifdef SWIG_PYTHON_CAST_MODE