diff --git a/include/fmt/chrono.h b/include/fmt/chrono.h
index 1ed94ace..46a93fde 100644
--- a/include/fmt/chrono.h
+++ b/include/fmt/chrono.h
@@ -1838,7 +1838,7 @@ struct chrono_formatter {
       } else {
         write(second(), 2);
         write_fractional_seconds<char_type>(
-            out, std::chrono::duration<Rep, Period>(val));
+            out, std::chrono::duration<rep, Period>(val));
       }
       return;
     }
diff --git a/test/chrono-test.cc b/test/chrono-test.cc
index fbc9fd61..d53ad56b 100644
--- a/test/chrono-test.cc
+++ b/test/chrono-test.cc
@@ -642,6 +642,15 @@ TEST(chrono_test, cpp20_duration_subsecond_support) {
                         std::chrono::duration<long long, std::ratio<1, 7>>(1)),
             "00.142857");
 
+  EXPECT_EQ(fmt::format("{:%S}",
+                        std::chrono::duration<char, std::ratio<1, 100>>(0x80)),
+            "-01.28");
+
+  EXPECT_EQ(
+      fmt::format("{:%M:%S}",
+                  std::chrono::duration<short, std::ratio<1, 100>>(0x8000)),
+      "-05:27.68");
+
   // Check that floating point seconds with ratio<1,1> are printed.
   EXPECT_EQ(fmt::format("{:%S}", std::chrono::duration<double>{1.5}),
             "01.500000");