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-rw-r--r--test/cpp/util/echo_duplicate.proto2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/cpp/util/echo_duplicate.proto b/test/cpp/util/echo_duplicate.proto
index e54c016d2f..9c1d67825a 100644
--- a/test/cpp/util/echo_duplicate.proto
+++ b/test/cpp/util/echo_duplicate.proto
@@ -30,7 +30,7 @@
// This is a partial copy of echo.proto with a different package name.
-syntax = "proto2";
+syntax = "proto3";
import "test/cpp/util/messages.proto";