diff --git a/src/system/libroot/posix/pthread/pthread.c b/src/system/libroot/posix/pthread/pthread.c
index b702de4863..ffd1f5a4d4 100644
--- a/src/system/libroot/posix/pthread/pthread.c
+++ b/src/system/libroot/posix/pthread/pthread.c
@@ -86,6 +86,8 @@ __allocate_pthread(void *data)
 	thread->cleanup_handlers = NULL;
 	thread->flags = 0;
 
+	memset(thread->specific, 0, sizeof(thread->specific));
+
 	return thread;
 }