diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 9dade1d..085d585 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -1290,6 +1290,7 @@
 			char *straddr;
 
 			addr = (struct sockaddr_l2 *)addr_ret;
+			memset(addr, 0, sizeof(struct sockaddr_l2));
 			_BT_L2_MEMB(addr, family) = AF_BLUETOOTH;
 			if (!PyArg_ParseTuple(args, "si", &straddr,
 					      &_BT_L2_MEMB(addr, psm))) {