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-rw-r--r--pb_encode.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/pb_encode.h b/pb_encode.h
index 59ec554b..af6cc3c5 100644
--- a/pb_encode.h
+++ b/pb_encode.h
@@ -54,7 +54,7 @@ bool pb_encode_tag_for_field(pb_ostream_t *stream, const pb_field_t *field);
/* Encode field header by manually specifing wire type. You need to use this if
* you want to write out packed arrays from a callback field. */
-bool pb_encode_tag(pb_ostream_t *stream, pb_wire_type_t wiretype, int field_number);
+bool pb_encode_tag(pb_ostream_t *stream, pb_wire_type_t wiretype, uint32_t field_number);
/* Encode an integer in the varint format.
* This works for bool, enum, int32, int64, uint32 and uint64 field types. */