diff --git a/tonic-build/src/client.rs b/tonic-build/src/client.rs
index 913d3e7bb..4c3198484 100644
--- a/tonic-build/src/client.rs
+++ b/tonic-build/src/client.rs
@@ -167,7 +167,7 @@ fn generate_unary<T: Method>(
     compile_well_known_types: bool,
     path: String,
 ) -> TokenStream {
-    let codec_name = syn::parse_str::<syn::Path>(T::CODEC_PATH).unwrap();
+    let codec_name = syn::parse_str::<syn::Path>(method.codec_path()).unwrap();
     let ident = format_ident!("{}", method.name());
     let (request, response) = method.request_response_name(proto_path, compile_well_known_types);
 
@@ -192,7 +192,7 @@ fn generate_server_streaming<T: Method>(
     compile_well_known_types: bool,
     path: String,
 ) -> TokenStream {
-    let codec_name = syn::parse_str::<syn::Path>(T::CODEC_PATH).unwrap();
+    let codec_name = syn::parse_str::<syn::Path>(method.codec_path()).unwrap();
     let ident = format_ident!("{}", method.name());
 
     let (request, response) = method.request_response_name(proto_path, compile_well_known_types);
@@ -218,7 +218,7 @@ fn generate_client_streaming<T: Method>(
     compile_well_known_types: bool,
     path: String,
 ) -> TokenStream {
-    let codec_name = syn::parse_str::<syn::Path>(T::CODEC_PATH).unwrap();
+    let codec_name = syn::parse_str::<syn::Path>(method.codec_path()).unwrap();
     let ident = format_ident!("{}", method.name());
 
     let (request, response) = method.request_response_name(proto_path, compile_well_known_types);
@@ -244,7 +244,7 @@ fn generate_streaming<T: Method>(
     compile_well_known_types: bool,
     path: String,
 ) -> TokenStream {
-    let codec_name = syn::parse_str::<syn::Path>(T::CODEC_PATH).unwrap();
+    let codec_name = syn::parse_str::<syn::Path>(method.codec_path()).unwrap();
     let ident = format_ident!("{}", method.name());
 
     let (request, response) = method.request_response_name(proto_path, compile_well_known_types);
diff --git a/tonic-build/src/lib.rs b/tonic-build/src/lib.rs
index 56f05d0e5..e6c11916a 100644
--- a/tonic-build/src/lib.rs
+++ b/tonic-build/src/lib.rs
@@ -91,9 +91,6 @@ pub mod server;
 /// to allow any codegen module to generate service
 /// abstractions.
 pub trait Service {
-    /// Path to the codec.
-    const CODEC_PATH: &'static str;
-
     /// Comment type.
     type Comment: AsRef<str>;
 
@@ -119,8 +116,6 @@ pub trait Service {
 /// to generate abstraction implementations for
 /// the provided methods.
 pub trait Method {
-    /// Path to the codec.
-    const CODEC_PATH: &'static str;
     /// Comment type.
     type Comment: AsRef<str>;
 
@@ -128,6 +123,8 @@ pub trait Method {
     fn name(&self) -> &str;
     /// Identifier used to generate type name.
     fn identifier(&self) -> &str;
+    /// Path to the codec.
+    fn codec_path(&self) -> &str;
     /// Method is streamed by client.
     fn client_streaming(&self) -> bool;
     /// Method is streamed by server.
diff --git a/tonic-build/src/prost.rs b/tonic-build/src/prost.rs
index 750bcd677..779414dd9 100644
--- a/tonic-build/src/prost.rs
+++ b/tonic-build/src/prost.rs
@@ -2,9 +2,11 @@ use super::{client, server, Attributes};
 use proc_macro2::TokenStream;
 use prost_build::{Config, Method, Service};
 use quote::ToTokens;
-use std::ffi::OsString;
-use std::io;
-use std::path::{Path, PathBuf};
+use std::{
+    ffi::OsString,
+    io,
+    path::{Path, PathBuf},
+};
 
 /// Configure `tonic-build` code generation.
 ///
@@ -51,8 +53,6 @@ const PROST_CODEC_PATH: &str = "tonic::codec::ProstCodec";
 const NON_PATH_TYPE_ALLOWLIST: &[&str] = &["()"];
 
 impl crate::Service for Service {
-    const CODEC_PATH: &'static str = PROST_CODEC_PATH;
-
     type Method = Method;
     type Comment = String;
 
@@ -78,7 +78,6 @@ impl crate::Service for Service {
 }
 
 impl crate::Method for Method {
-    const CODEC_PATH: &'static str = PROST_CODEC_PATH;
     type Comment = String;
 
     fn name(&self) -> &str {
@@ -89,6 +88,10 @@ impl crate::Method for Method {
         &self.proto_name
     }
 
+    fn codec_path(&self) -> &str {
+        PROST_CODEC_PATH
+    }
+
     fn client_streaming(&self) -> bool {
         self.client_streaming
     }
diff --git a/tonic-build/src/server.rs b/tonic-build/src/server.rs
index ac432ad28..affd2db38 100644
--- a/tonic-build/src/server.rs
+++ b/tonic-build/src/server.rs
@@ -366,7 +366,7 @@ fn generate_unary<T: Method>(
     method_ident: Ident,
     server_trait: Ident,
 ) -> TokenStream {
-    let codec_name = syn::parse_str::<syn::Path>(T::CODEC_PATH).unwrap();
+    let codec_name = syn::parse_str::<syn::Path>(method.codec_path()).unwrap();
 
     let service_ident = quote::format_ident!("{}Svc", method.identifier());
 
@@ -415,7 +415,7 @@ fn generate_server_streaming<T: Method>(
     method_ident: Ident,
     server_trait: Ident,
 ) -> TokenStream {
-    let codec_name = syn::parse_str::<syn::Path>(T::CODEC_PATH).unwrap();
+    let codec_name = syn::parse_str::<syn::Path>(method.codec_path()).unwrap();
 
     let service_ident = quote::format_ident!("{}Svc", method.identifier());
 
@@ -470,7 +470,7 @@ fn generate_client_streaming<T: Method>(
     let service_ident = quote::format_ident!("{}Svc", method.identifier());
 
     let (request, response) = method.request_response_name(proto_path, compile_well_known_types);
-    let codec_name = syn::parse_str::<syn::Path>(T::CODEC_PATH).unwrap();
+    let codec_name = syn::parse_str::<syn::Path>(method.codec_path()).unwrap();
 
     quote! {
         #[allow(non_camel_case_types)]
@@ -517,7 +517,7 @@ fn generate_streaming<T: Method>(
     method_ident: Ident,
     server_trait: Ident,
 ) -> TokenStream {
-    let codec_name = syn::parse_str::<syn::Path>(T::CODEC_PATH).unwrap();
+    let codec_name = syn::parse_str::<syn::Path>(method.codec_path()).unwrap();
 
     let service_ident = quote::format_ident!("{}Svc", method.identifier());