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-rw-r--r--tests/cyclic_messages/cyclic.proto2
1 files changed, 2 insertions, 0 deletions
diff --git a/tests/cyclic_messages/cyclic.proto b/tests/cyclic_messages/cyclic.proto
index a9d158cb..8cab0b14 100644
--- a/tests/cyclic_messages/cyclic.proto
+++ b/tests/cyclic_messages/cyclic.proto
@@ -2,6 +2,8 @@
// These can only be handled in pointer/callback mode,
// see associated .options files.
+syntax = "proto2";
+
message TreeNode
{
optional int32 leaf = 1;