diff --git a/protobuf/src/reflect/dynamic/map.rs b/protobuf/src/reflect/dynamic/map.rs
index 902f9bfa0..c57b55ce2 100644
--- a/protobuf/src/reflect/dynamic/map.rs
+++ b/protobuf/src/reflect/dynamic/map.rs
@@ -115,7 +115,7 @@ impl DynamicMap {
 
 struct DynamicMapIterImpl<'a, K: ProtobufValue + Eq + Hash + 'static> {
     iter: hash_map::Iter<'a, K, ReflectValueBox>,
-    value: &'a RuntimeType,
+    _value_type: &'a RuntimeType,
 }
 
 impl<'a, K: ProtobufValue + Eq + Hash + 'static> ReflectMapIterTrait<'a>
@@ -131,8 +131,8 @@ impl<'a, K: ProtobufValue + Eq + Hash + 'static> ReflectMapIterTrait<'a>
         K::RuntimeType::runtime_type_box()
     }
 
-    fn value_type(&self) -> RuntimeType {
-        self.value.clone()
+    fn _value_type(&self) -> RuntimeType {
+        self._value_type.clone()
     }
 }
 
@@ -141,27 +141,27 @@ impl ReflectMap for DynamicMap {
         match &self.maps {
             Maps::U32(m) => ReflectMapIter::new(DynamicMapIterImpl {
                 iter: m.iter(),
-                value: &self.value,
+                _value_type: &self.value,
             }),
             Maps::I32(m) => ReflectMapIter::new(DynamicMapIterImpl {
                 iter: m.iter(),
-                value: &self.value,
+                _value_type: &self.value,
             }),
             Maps::U64(m) => ReflectMapIter::new(DynamicMapIterImpl {
                 iter: m.iter(),
-                value: &self.value,
+                _value_type: &self.value,
             }),
             Maps::I64(m) => ReflectMapIter::new(DynamicMapIterImpl {
                 iter: m.iter(),
-                value: &self.value,
+                _value_type: &self.value,
             }),
             Maps::Bool(m) => ReflectMapIter::new(DynamicMapIterImpl {
                 iter: m.iter(),
-                value: &self.value,
+                _value_type: &self.value,
             }),
             Maps::String(m) => ReflectMapIter::new(DynamicMapIterImpl {
                 iter: m.iter(),
-                value: &self.value,
+                _value_type: &self.value,
             }),
         }
     }
diff --git a/protobuf/src/reflect/map/empty.rs b/protobuf/src/reflect/map/empty.rs
index 5ac908de3..f8be6a3d4 100644
--- a/protobuf/src/reflect/map/empty.rs
+++ b/protobuf/src/reflect/map/empty.rs
@@ -67,7 +67,7 @@ impl<'a> ReflectMapIterTrait<'a> for DynamicEmptyMapIter {
         self.key_type.clone()
     }
 
-    fn value_type(&self) -> RuntimeType {
+    fn _value_type(&self) -> RuntimeType {
         self.value_type.clone()
     }
 }
diff --git a/protobuf/src/reflect/map/generated.rs b/protobuf/src/reflect/map/generated.rs
index d1f01047e..3fc8b402b 100644
--- a/protobuf/src/reflect/map/generated.rs
+++ b/protobuf/src/reflect/map/generated.rs
@@ -118,7 +118,7 @@ impl<'a, K: ProtobufValue, V: ProtobufValue, I: Iterator<Item = (&'a K, &'a V)>>
         K::RuntimeType::runtime_type_box()
     }
 
-    fn value_type(&self) -> RuntimeType {
+    fn _value_type(&self) -> RuntimeType {
         V::RuntimeType::runtime_type_box()
     }
 }
diff --git a/protobuf/src/reflect/map/mod.rs b/protobuf/src/reflect/map/mod.rs
index c927473fa..806176892 100644
--- a/protobuf/src/reflect/map/mod.rs
+++ b/protobuf/src/reflect/map/mod.rs
@@ -34,7 +34,7 @@ pub(crate) trait ReflectMap: Debug + Send + Sync + 'static {
 pub(crate) trait ReflectMapIterTrait<'a> {
     fn next(&mut self) -> Option<(ReflectValueRef<'a>, ReflectValueRef<'a>)>;
     fn key_type(&self) -> RuntimeType;
-    fn value_type(&self) -> RuntimeType;
+    fn _value_type(&self) -> RuntimeType;
 }
 
 pub struct ReflectMapIter<'a> {
@@ -252,7 +252,7 @@ impl<'a> ReflectMapRefIter<'a> {
     }
 
     fn _value_type(&self) -> RuntimeType {
-        self.iter.imp.value_type()
+        self.iter.imp._value_type()
     }
 }