diff --git a/runtime/indent/proto.vim b/runtime/indent/proto.vim
new file mode 100644
index 0000000..743f140
--- /dev/null
+++ b/runtime/indent/proto.vim
@@ -0,0 +1,19 @@
+" Vim indent file
+" Language:	Protobuf
+" Maintainer:	David Pedersen <limero@me.com>
+" Last Change:	2024 Aug 07
+
+" Only load this indent file when no other was loaded.
+if exists("b:did_indent")
+  finish
+endif
+let b:did_indent = 1
+
+" Protobuf is like indenting C
+setlocal cindent
+setlocal expandtab
+setlocal shiftwidth=2
+
+let b:undo_indent = "setlocal cindent< expandtab< shiftwidth<"
+
+" vim: sw=2 sts=2 et