diff --git a/src/platform_posix.cc b/src/platform_posix.cc
index 5a937c65..885e9557 100644
--- a/src/platform_posix.cc
+++ b/src/platform_posix.cc
@@ -1,7 +1,7 @@
 // Copyright 2017-2018 ccls Authors
 // SPDX-License-Identifier: Apache-2.0
 
-#if defined(__unix__) || defined(__APPLE__)
+#if defined(__unix__) || defined(__APPLE__) || defined(__HAIKU__)
 #include "platform.hh"
 
 #include "utils.hh"