diff --git a/Makefile b/Makefile
index ebfe5768..88ee1aa2 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,8 @@ else ifneq ($(findstring MSYS_NT,$(UNAME)),)
     OS := windows
     EXT := dll
 else
-    $(error Unsupported operating system: $(UNAME))
+    OS := windows
+    EXT := dll
 endif
 
 LUA_VERSIONS := luajit lua51