diff --git a/Makefile b/Makefile
index c6eb229..48ff00d 100644
--- a/Makefile
+++ b/Makefile
@@ -161,7 +161,7 @@ clean:
 dep:
 	$(CC) -MM *.c
 
-ifeq ($(uname_S),SunOS)
+ifeq ($(uname_S),$(filter $(uname_S),SunOS OpenBSD))
   INSTALL?= cp -r
 endif