diff --git a/libc/upstream-openbsd/gdtoa_support.cpp b/libc/upstream-openbsd/gdtoa_support.cpp
new file mode 100644
index 0000000..4e7bf3b
--- /dev/null
+++ b/libc/upstream-openbsd/gdtoa_support.cpp
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <pthread.h>
+
+__LIBC_HIDDEN__ pthread_mutex_t __dtoa_locks[] = { PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER };