diff --git a/scripts/mk_util.py b/scripts/mk_util.py
index 6744c6a0f..837c3827c 100644
--- a/scripts/mk_util.py
+++ b/scripts/mk_util.py
@@ -1191,7 +1191,7 @@ def get_so_ext():
     sysname = os.uname()[0]
     if sysname == 'Darwin':
         return 'dylib'
-    elif sysname == 'Linux' or sysname == 'FreeBSD':
+    elif sysname == 'Linux' or sysname == 'FreeBSD' or sysname == 'OpenBSD':
         return 'so'
     elif sysname == 'CYGWIN':
         return 'dll'