diff --git a/src/with.rs b/src/with.rs
index 26880cfc..d0bdc7c4 100644
--- a/src/with.rs
+++ b/src/with.rs
@@ -318,6 +318,10 @@ pub mod singleton_map {
         {
             self.delegate.collect_str(value)
         }
+
+        fn is_human_readable(&self) -> bool {
+            self.delegate.is_human_readable()
+        }
     }
 
     struct SerializeTupleVariantAsSingletonMap<M> {
@@ -629,6 +633,10 @@ pub mod singleton_map {
         {
             self.delegate.deserialize_ignored_any(visitor)
         }
+
+        fn is_human_readable(&self) -> bool {
+            self.delegate.is_human_readable()
+        }
     }
 
     struct SingletonMapAsEnum<D> {
@@ -1183,6 +1191,10 @@ pub mod singleton_map_recursive {
         {
             self.delegate.collect_str(value)
         }
+
+        fn is_human_readable(&self) -> bool {
+            self.delegate.is_human_readable()
+        }
     }
 
     impl<D> SerializeSeq for SingletonMapRecursive<D>
@@ -1653,6 +1665,10 @@ pub mod singleton_map_recursive {
             self.delegate
                 .deserialize_ignored_any(SingletonMapRecursive { delegate: visitor })
         }
+
+        fn is_human_readable(&self) -> bool {
+            self.delegate.is_human_readable()
+        }
     }
 
     impl<'de, V> Visitor<'de> for SingletonMapRecursive<V>