diff --git a/prost-build/src/code_generator.rs b/prost-build/src/code_generator.rs
index 1f22acbe2..ef6c15b34 100644
--- a/prost-build/src/code_generator.rs
+++ b/prost-build/src/code_generator.rs
@@ -573,13 +573,25 @@ impl<'b> CodeGenerator<'_, 'b> {
         ));
         self.append_field_attributes(fq_message_name, field.descriptor.name());
         self.push_indent();
-        self.buf.push_str(&format!(
-            "pub {}: {}<{}, {}>,\n",
-            field.rust_name(),
-            map_type.rust_type(),
-            key_ty,
-            value_ty
-        ));
+        match map_type {
+            crate::MapType::HashMap => {
+                self.buf.push_str(&format!(
+                    "pub {}: ::std::collections::HashMap<{}, {}>,\n",
+                    field.rust_name(),
+                    key_ty,
+                    value_ty
+                ));
+            }
+            crate::MapType::BTreeMap => {
+                self.buf.push_str(&format!(
+                    "pub {}: {}::alloc::collections::BTreeMap<{}, {}>,\n",
+                    field.rust_name(),
+                    self.context.prost_path(),
+                    key_ty,
+                    value_ty
+                ));
+            }
+        }
     }
 
     fn append_oneof_field(
@@ -685,8 +697,9 @@ impl<'b> CodeGenerator<'_, 'b> {
 
             if boxed {
                 self.buf.push_str(&format!(
-                    "{}(::prost::alloc::boxed::Box<{}>),\n",
+                    "{}({}::alloc::boxed::Box<{}>),\n",
                     to_upper_camel(field.descriptor.name()),
+                    self.context.prost_path(),
                     ty
                 ));
             } else {
@@ -983,11 +996,12 @@ impl<'b> CodeGenerator<'_, 'b> {
             Type::Int64 | Type::Sfixed64 | Type::Sint64 => String::from("i64"),
             Type::Bool => String::from("bool"),
             Type::String => format!("{}::alloc::string::String", self.context.prost_path()),
-            Type::Bytes => self
-                .context
-                .bytes_type(fq_message_name, field.name())
-                .rust_type()
-                .to_owned(),
+            Type::Bytes => match self.context.bytes_type(fq_message_name, field.name()) {
+                crate::BytesType::Vec => {
+                    format!("{}::alloc::vec::Vec<u8>", self.context.prost_path())
+                }
+                crate::BytesType::Bytes => format!("{}::bytes::Bytes", self.context.prost_path()),
+            },
             Type::Group | Type::Message => self.resolve_ident(field.type_name()),
         }
     }
diff --git a/prost-build/src/collections.rs b/prost-build/src/collections.rs
index e55625cf3..29a635c23 100644
--- a/prost-build/src/collections.rs
+++ b/prost-build/src/collections.rs
@@ -28,14 +28,6 @@ impl MapType {
             MapType::BTreeMap => "btree_map",
         }
     }
-
-    /// The fully-qualified Rust type corresponding to the map type.
-    pub fn rust_type(&self) -> &'static str {
-        match self {
-            MapType::HashMap => "::std::collections::HashMap",
-            MapType::BTreeMap => "::prost::alloc::collections::BTreeMap",
-        }
-    }
 }
 
 impl BytesType {
@@ -46,12 +38,4 @@ impl BytesType {
             BytesType::Bytes => "bytes",
         }
     }
-
-    /// The fully-qualified Rust type corresponding to the bytes type.
-    pub fn rust_type(&self) -> &'static str {
-        match self {
-            BytesType::Vec => "::prost::alloc::vec::Vec<u8>",
-            BytesType::Bytes => "::prost::bytes::Bytes",
-        }
-    }
 }