diff --git a/include/fmt/chrono.h b/include/fmt/chrono.h
index b938461a2478..83a75623ad8a 100644
--- a/include/fmt/chrono.h
+++ b/include/fmt/chrono.h
@@ -588,7 +588,7 @@ struct chrono_formatter {
   }
 
   void write_nan() { std::copy_n("nan", 3, out); }
-  void write_pinf() { std::copy_n("+inf", 4, out); }
+  void write_pinf() { std::copy_n("inf", 3, out); }
   void write_ninf() { std::copy_n("-inf", 4, out); }
 
   void format_localized(const tm& time, const char* format) {