diff --git a/include/openmc/output.h b/include/openmc/output.h
index 7fcaa81ba..0ad8b2fe5 100644
--- a/include/openmc/output.h
+++ b/include/openmc/output.h
@@ -62,7 +62,6 @@ void write_tallies();
 void show_time(const char* label, double secs, int indent_level = 0);
 
 } // namespace openmc
-#endif // OPENMC_OUTPUT_H
 
 //////////////////////////////////////
 // Custom formatters
@@ -89,3 +88,5 @@ struct formatter<std::array<T, 2>> {
 }; // namespace fmt
 
 } // namespace fmt
+
+#endif // OPENMC_OUTPUT_H