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-rw-r--r--src/libutil/logging.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libutil/logging.hh b/src/libutil/logging.hh
index 81aebccdca..a8c69dbd95 100644
--- a/src/libutil/logging.hh
+++ b/src/libutil/logging.hh
@@ -88,7 +88,7 @@ template<typename... Args>
 inline void warn(const std::string & fs, Args... args)
 {
     boost::format f(fs);
-    formatHelper(f, args...);
+    nop{boost::io::detail::feed(f, args)...};
     logger->warn(f.str());
 }