diff --git a/src/uuid/version3.c b/src/uuid/version3.c
index 3033fa2..f25e2d9 100644
--- a/src/uuid/version3.c
+++ b/src/uuid/version3.c
@@ -61,6 +61,8 @@ uuidVersion3(const unsigned char * name, size_t nname, Uuid nsid)
 	MD5_Update(&ctx, name, nname);
 	MD5_Final(hash, &ctx);
 
+	delete(net_nsid);
+
 	_uuidFormat3or5(uuid, hash, 3);
 
 	return uuid;
diff --git a/src/uuid/version5.c b/src/uuid/version5.c
index 2fb4d6f..0274fcb 100644
--- a/src/uuid/version5.c
+++ b/src/uuid/version5.c
@@ -61,6 +61,8 @@ uuidVersion5(const unsigned char * name, size_t nname, Uuid nsid)
 	SHA1_Update(&ctx, name, nname);
 	SHA1_Final(hash, &ctx);
 
+	delete(net_nsid);
+
 	_uuidFormat3or5(uuid, hash, 5);
 
 	return uuid;