diff --git a/Makefile b/Makefile
index b7c47bd..455bab8 100644
--- a/Makefile
+++ b/Makefile
@@ -59,5 +59,5 @@ uninstall:
 	-$(RMDIR) $(DESTDIR)$(LIBDIR)/osx/include $(DESTDIR)$(LIBDIR)/osx
 
 clean:
-    -$(RM) -R doc
+	-$(RM) -R doc
 	-$(RM) $(lib) $(o) $(_o)