diff --git a/src/serialize/per_type/datetime.rs b/src/serialize/per_type/datetime.rs
index ae5fb35b..951398e7 100644
--- a/src/serialize/per_type/datetime.rs
+++ b/src/serialize/per_type/datetime.rs
@@ -73,7 +73,7 @@ impl Serialize for Date {
     {
         let mut buf = DateTimeBuffer::new();
         self.write_buf(&mut buf);
-        serializer.serialize_str(str_from_slice!(buf.as_ptr(), buf.len()))
+        serializer.serialize_unit_struct(str_from_slice!(buf.as_ptr(), buf.len()))
     }
 }
 
@@ -124,7 +124,7 @@ impl Serialize for Time {
         if self.write_buf(&mut buf).is_err() {
             err!(SerializeError::DatetimeLibraryUnsupported)
         };
-        serializer.serialize_str(str_from_slice!(buf.as_ptr(), buf.len()))
+        serializer.serialize_unit_struct(str_from_slice!(buf.as_ptr(), buf.len()))
     }
 }
 
@@ -243,6 +243,6 @@ impl Serialize for DateTime {
         if self.write_buf(&mut buf, self.opts).is_err() {
             err!(SerializeError::DatetimeLibraryUnsupported)
         }
-        serializer.serialize_str(str_from_slice!(buf.as_ptr(), buf.len()))
+        serializer.serialize_unit_struct(str_from_slice!(buf.as_ptr(), buf.len()))
     }
 }
diff --git a/src/serialize/per_type/uuid.rs b/src/serialize/per_type/uuid.rs
index ff02fc10..83cbbed9 100644
--- a/src/serialize/per_type/uuid.rs
+++ b/src/serialize/per_type/uuid.rs
@@ -60,6 +60,6 @@ impl Serialize for UUID {
     {
         let mut buf = arrayvec::ArrayVec::<u8, 36>::new();
         self.write_buf(&mut buf);
-        serializer.serialize_str(str_from_slice!(buf.as_ptr(), buf.len()))
+        serializer.serialize_unit_struct(str_from_slice!(buf.as_ptr(), buf.len()))
     }
 }
diff --git a/src/serialize/writer/json.rs b/src/serialize/writer/json.rs
index c6a51056..9b60e891 100644
--- a/src/serialize/writer/json.rs
+++ b/src/serialize/writer/json.rs
@@ -166,8 +166,18 @@ where
             .map_err(Error::io)
     }
 
-    fn serialize_unit_struct(self, _name: &'static str) -> Result<()> {
-        unreachable!();
+    #[inline(always)]
+    fn serialize_unit_struct(self, name: &'static str) -> Result<()> {
+        debug_assert!(name.len() <= 36);
+        reserve_minimum!(self.writer);
+        unsafe {
+            self.writer.write_reserved_punctuation(b'"').unwrap();
+            self.writer
+                .write_reserved_fragment(name.as_bytes())
+                .unwrap();
+            self.writer.write_reserved_punctuation(b'"').unwrap();
+        }
+        Ok(())
     }
 
     fn serialize_unit_variant(