diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index f4a80c2..35d61ba 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -78,8 +78,6 @@
 #  define MAP_ANONYMOUS MAP_ANON
 #endif
 
-static PyObject *mmap_module_error;
-
 typedef enum
 {
     ACCESS_DEFAULT,
@@ -459,7 +457,7 @@
     {
         struct stat buf;
         if (-1 == fstat(self->fd, &buf)) {
-            PyErr_SetFromErrno(mmap_module_error);
+            PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
         }
 #ifdef HAVE_LARGEFILE_SUPPORT
@@ -549,7 +547,7 @@
         void *newmap;
 
         if (ftruncate(self->fd, self->offset + new_size) == -1) {
-            PyErr_SetFromErrno(mmap_module_error);
+            PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
         }
 
@@ -564,7 +562,7 @@
 #endif
         if (newmap == (void *)-1)
         {
-            PyErr_SetFromErrno(mmap_module_error);
+            PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
         }
         self->data = newmap;
@@ -605,7 +603,7 @@
     /* XXX semantics of return value? */
     /* XXX flags for msync? */
     if (-1 == msync(self->data + offset, size, MS_SYNC)) {
-        PyErr_SetFromErrno(mmap_module_error);
+        PyErr_SetFromErrno(PyExc_OSError);
         return NULL;
     }
     return PyLong_FromLong(0);
@@ -1205,7 +1203,7 @@
         fd = devzero = open("/dev/zero", O_RDWR);
         if (devzero == -1) {
             Py_DECREF(m_obj);
-            PyErr_SetFromErrno(mmap_module_error);
+            PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
         }
 #endif
@@ -1213,7 +1211,7 @@
         m_obj->fd = dup(fd);
         if (m_obj->fd == -1) {
             Py_DECREF(m_obj);
-            PyErr_SetFromErrno(mmap_module_error);
+            PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
         }
     }
@@ -1229,7 +1227,7 @@
     if (m_obj->data == (char *)-1) {
         m_obj->data = NULL;
         Py_DECREF(m_obj);
-        PyErr_SetFromErrno(mmap_module_error);
+        PyErr_SetFromErrno(PyExc_OSError);
         return NULL;
     }
     m_obj->access = (access_mode)access;
@@ -1310,12 +1308,12 @@
     if (fileno != -1 && fileno != 0) {
         /* Ensure that fileno is within the CRT's valid range */
         if (_PyVerify_fd(fileno) == 0) {
-            PyErr_SetFromErrno(mmap_module_error);
+            PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
         }
         fh = (HANDLE)_get_osfhandle(fileno);
         if (fh==(HANDLE)-1) {
-            PyErr_SetFromErrno(mmap_module_error);
+            PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
         }
         /* Win9x appears to need us seeked to zero */
@@ -1469,11 +1467,7 @@
     dict = PyModule_GetDict(module);
     if (!dict)
         return NULL;
-    mmap_module_error = PyErr_NewException("mmap.error",
-        PyExc_EnvironmentError , NULL);
-    if (mmap_module_error == NULL)
-        return NULL;
-    PyDict_SetItemString(dict, "error", mmap_module_error);
+    PyDict_SetItemString(dict, "error", PyExc_OSError);
     PyDict_SetItemString(dict, "mmap", (PyObject*) &mmap_object_type);
 #ifdef PROT_EXEC
     setint(dict, "PROT_EXEC", PROT_EXEC);