diff --git a/build/landmine_utils.py b/build/landmine_utils.py
index 9b667d0..6d18b6d 100644
--- a/build/landmine_utils.py
+++ b/build/landmine_utils.py
@@ -33,7 +33,7 @@
 
 @memoize()
 def IsLinux():
-  return sys.platform.startswith(('linux', 'freebsd'))
+  return sys.platform.startswith(('linux', 'freebsd', 'openbsd'))
 
 
 @memoize()