diff --git a/build/Cargo.toml b/build/Cargo.toml
index a23be06..f7fb8d9 100644
--- a/build/Cargo.toml
+++ b/build/Cargo.toml
@@ -8,9 +8,6 @@ authors.workspace = true
 edition.workspace = true
 license.workspace = true
 
-[features]
-grpc = []
-
 [dependencies]
 regex.workspace = true
 prost-build.workspace = true
diff --git a/build/src/lib.rs b/build/src/lib.rs
index d1a6597..3d9d2b2 100644
--- a/build/src/lib.rs
+++ b/build/src/lib.rs
@@ -48,6 +48,12 @@ impl TwirpBuilder {
         self
     }
 
+    /// Generates code for gRPC alongside Twirp.
+    pub fn with_grpc(mut self) -> Self {
+        self.generator = self.generator.with_grpc();
+        self
+    }
+
     /// Adds an extra parameter to generated server methods that implements [`axum::FromRequestParts`](https://docs.rs/axum/latest/axum/extract/trait.FromRequestParts.html).
     ///
     /// For example
@@ -179,6 +185,7 @@ impl TwirpBuilder {
 struct TwirpServiceGenerator {
     client: bool,
     server: bool,
+    grpc: bool,
     request_extractors: Vec<(String, String)>,
 }
 
@@ -197,6 +204,11 @@ impl TwirpServiceGenerator {
         self
     }
 
+    pub fn with_grpc(mut self) -> Self {
+        self.grpc = true;
+        self
+    }
+
     pub fn with_axum_request_extractor(
         mut self,
         name: impl Into<String>,
@@ -278,7 +290,7 @@ impl TwirpServiceGenerator {
             writeln!(buf, "#[::twurst_server::codegen::trait_variant_make(Send)]")?;
             writeln!(buf, "pub trait {} {{", service.name)?;
             for method in &service.methods {
-                if !cfg!(feature = "grpc") && (method.client_streaming || method.server_streaming) {
+                if !self.grpc && (method.client_streaming || method.server_streaming) {
                     continue; // No streaming
                 }
                 for comment in &method.comments.leading {
@@ -353,7 +365,7 @@ impl TwirpServiceGenerator {
             writeln!(buf, "            .build()")?;
             writeln!(buf, "    }}")?;
 
-            if cfg!(feature = "grpc") {
+            if self.grpc {
                 writeln!(buf)?;
                 writeln!(
                     buf,
diff --git a/example/server/Cargo.toml b/example/server/Cargo.toml
index 1c15f38..9128faf 100644
--- a/example/server/Cargo.toml
+++ b/example/server/Cargo.toml
@@ -16,4 +16,4 @@ tokio = { workspace = true, features = ["rt-multi-thread"] }
 tower-http = { workspace = true, features = ["cors"] }
 
 [build-dependencies]
-twurst-build = { path = "../../build", features = ["grpc"] }
+twurst-build.path = "../../build"
diff --git a/example/server/build.rs b/example/server/build.rs
index 3e6cf72..e336b66 100644
--- a/example/server/build.rs
+++ b/example/server/build.rs
@@ -1,6 +1,7 @@
 fn main() -> std::io::Result<()> {
     twurst_build::TwirpBuilder::new()
         .with_server()
+        .with_grpc()
         .with_axum_request_extractor("headers", "::axum::http::HeaderMap")
         .compile_protos(&["../example_service.proto"], &[".."])
 }
diff --git a/integration/Cargo.toml b/integration/Cargo.toml
index baa15e9..596eb05 100644
--- a/integration/Cargo.toml
+++ b/integration/Cargo.toml
@@ -21,5 +21,5 @@ tower.workspace = true
 tower-http = { workspace = true, features = ["auth", "cors"] }
 
 [build-dependencies]
-twurst-build = { path = "../build", features = ["grpc"] }
+twurst-build.path = "../build"
 tonic-build.workspace = true
diff --git a/integration/build.rs b/integration/build.rs
index ecce77d..b4bdecf 100644
--- a/integration/build.rs
+++ b/integration/build.rs
@@ -5,6 +5,7 @@ fn main() -> std::io::Result<()> {
     twurst_build::TwirpBuilder::new()
         .with_client()
         .with_server()
+        .with_grpc()
         .with_axum_request_extractor("bearer_token", "crate::server::ExtractBearerToken")
         .compile_protos(&["integration.proto"], &["."])?;