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-rw-r--r--src/text/json_formatter.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/text/json_formatter.cpp b/src/text/json_formatter.cpp
index 778f57c022..f5dc2bb661 100644
--- a/src/text/json_formatter.cpp
+++ b/src/text/json_formatter.cpp
@@ -179,7 +179,7 @@ namespace //anonymous
};
}
-void json_formatter::write(std::ostream& os, const tag& t)
+void json_formatter::write(std::ostream& os, const tag& t) const
{
json_fmt_visitor v(os);
t.accept(v);