diff --git a/build.py b/build.py
index 29f219f4..5a84865f 100755
--- a/build.py
+++ b/build.py
@@ -38,11 +38,11 @@ unstable_series = (version.VER_MINOR % 2) == 1  # is the minor version odd or ev
 isWindows = sys.platform.startswith('win')
 isDarwin = sys.platform == "darwin"
 
-sipCurrentVersion = '4.13.1'
+sipCurrentVersion = '4.13.2'
 sipCurrentVersionMD5 = {
-    'darwin' : '542198b5a4b05a65c41ac888bc59f779',
-    'win32'  : '2a7194cbfbca8d0110c68857a94e0efa', 
-    'linux2' : '0049b8d33e83ae008fc2664ded4eb567', 
+    'darwin' : 'b9262c3ea3d2a0010f4c59c27c60e8c1',
+    'win32'  : 'b5885b420b7fe16e9dc5e32ef381a847', 
+    'linux2' : '5956f74dc9a1e0673633e7a494705dca', 
 }
 toolsURL = 'http://wxpython.org/Phoenix/tools'
 
diff --git a/sip/siplib/objmap.c b/sip/siplib/objmap.c
index 9d2c0a7a..13204bc1 100644
--- a/sip/siplib/objmap.c
+++ b/sip/siplib/objmap.c
@@ -264,9 +264,16 @@ static void add_object(sipObjectMap *om, void *addr, sipSimpleWrapper *val)
             {
                 sipSimpleWrapper *next = sw->next;
 
-                /* We are removing it from the map here. */
-                sipSetNotInMap(sw);
-                sip_api_common_dtor(sw);
+                if (sipIsAlias(sw))
+                {
+                    sip_api_free(sw);
+                }
+                else
+                {
+                    /* We are removing it from the map here. */
+                    sipSetNotInMap(sw);
+                    sip_api_common_dtor(sw);
+                }
 
                 sw = next;
             }
diff --git a/sip/siplib/sip.h b/sip/siplib/sip.h
index e314be24..6b540e06 100644
--- a/sip/siplib/sip.h
+++ b/sip/siplib/sip.h
@@ -54,8 +54,8 @@ extern "C" {
 /*
  * Define the SIP version number.
  */
-#define SIP_VERSION         0x040d01
-#define SIP_VERSION_STR     "4.13.1"
+#define SIP_VERSION         0x040d02
+#define SIP_VERSION_STR     "4.13.2"
 
 
 /*