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-rw-r--r--src/libutil/types.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libutil/types.hh b/src/libutil/types.hh
index 4bc91828b..4a6be28a2 100644
--- a/src/libutil/types.hh
+++ b/src/libutil/types.hh
@@ -67,7 +67,7 @@ inline std::string fmt(const FormatOrString & fs)
}
template<typename... Args>
-inline std::string fmt(const std::string & fs, Args... args)
+inline std::string fmt(const std::string & fs, const Args & ... args)
{
boost::format f(fs);
f.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);