diff --git a/include/fmt/chrono.h b/include/fmt/chrono.h
index 74fc8485..674d2cfc 100644
--- a/include/fmt/chrono.h
+++ b/include/fmt/chrono.h
@@ -2135,8 +2135,8 @@ struct formatter<std::chrono::time_point<std::chrono::system_clock, Duration>,
   auto format(std::chrono::time_point<std::chrono::system_clock, Duration> val,
               FormatContext& ctx) const -> decltype(ctx.out()) {
     using period = typename Duration::period;
-    if (period::num != 1 || period::den != 1 ||
-        std::is_floating_point<typename Duration::rep>::value) {
+    if constexpr (period::num != 1 || period::den != 1 ||
+                  std::is_floating_point<typename Duration::rep>::value) {
       const auto epoch = val.time_since_epoch();
       auto subsecs = std::chrono::duration_cast<Duration>(
           epoch - std::chrono::duration_cast<std::chrono::seconds>(epoch));
@@ -2153,10 +2153,10 @@ struct formatter<std::chrono::time_point<std::chrono::system_clock, Duration>,
       return formatter<std::tm, Char>::do_format(
           gmtime(std::chrono::time_point_cast<std::chrono::seconds>(val)), ctx,
           &subsecs);
+    } else {
+      return formatter<std::tm, Char>::format(
+          gmtime(std::chrono::time_point_cast<std::chrono::seconds>(val)), ctx);
     }
-
-    return formatter<std::tm, Char>::format(
-        gmtime(std::chrono::time_point_cast<std::chrono::seconds>(val)), ctx);
   }
 };