diff --git a/Cargo.toml b/Cargo.toml
index d9b4edd2..eef8be6e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -46,8 +46,10 @@ harness = false
 name = "text"
 path = "benches/encoding/text.rs"
 harness = false
+required-features = []
 
 [[bench]]
 name = "proto"
 path = "benches/encoding/proto.rs"
 harness = false
+required-features = ["protobuf"] 
diff --git a/benches/encoding/proto.rs b/benches/encoding/proto.rs
index 068a4d58..4de33a1a 100644
--- a/benches/encoding/proto.rs
+++ b/benches/encoding/proto.rs
@@ -1,7 +1,9 @@
-// Benchmark inspired by https://github.com/tikv/rust-prometheus/blob/ab1ca7285d3463504381a5025ae1951e020d6796/benches/text_encoder.rs
+// Benchmark inspired by
+// https://github.com/tikv/rust-prometheus/blob/ab1ca7285d3463504381a5025ae1951e020d6796/benches/text_encoder.rs:write
 
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
-use prometheus_client::encoding::proto::{encode, Encode, EncodeMetric};
+use prometheus_client::encoding::proto::{encode, EncodeMetric};
+use prometheus_client::encoding::Encode;
 use prometheus_client::metrics::counter::Counter;
 use prometheus_client::metrics::family::Family;
 use prometheus_client::metrics::histogram::{exponential_buckets, Histogram};
@@ -17,7 +19,7 @@ pub fn proto(c: &mut Criterion) {
             some_number: u64,
         }
 
-        #[derive(Clone, Hash, PartialEq, Eq)]
+        #[derive(Clone, Hash, PartialEq, Eq, Encode)]
         enum Method {
             Get,
             #[allow(dead_code)]
diff --git a/benches/encoding/text.rs b/benches/encoding/text.rs
index 78c2c4f3..fc02b5c8 100644
--- a/benches/encoding/text.rs
+++ b/benches/encoding/text.rs
@@ -2,6 +2,7 @@
 
 use criterion::{black_box, criterion_group, criterion_main, Criterion};
 use prometheus_client::encoding::text::{encode, Encode, EncodeMetric};
+use prometheus_client::encoding::Encode;
 use prometheus_client::metrics::counter::Counter;
 use prometheus_client::metrics::family::Family;
 use prometheus_client::metrics::histogram::{exponential_buckets, Histogram};
@@ -33,6 +34,26 @@ pub fn text(c: &mut Criterion) {
             Five,
         }
 
+        #[cfg(feature = "protobuf")]
+        impl std::fmt::Display for Method {
+            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+                match self {
+                    Method::Get => f.write_str("Get"),
+                    Method::Put => f.write_str("Put"),
+                }
+            }
+        }
+
+        #[cfg(feature = "protobuf")]
+        impl std::fmt::Display for Status {
+            fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+                match self {
+                    Status::Two => f.write_str("2"),
+                    Status::Four => f.write_str("4"),
+                    Status::Five => f.write_str("5"),
+                }
+            }
+        }
         impl Encode for Status {
             fn encode(&self, writer: &mut dyn Write) -> Result<(), std::io::Error> {
                 let status = match self {
diff --git a/derive-encode/src/lib.rs b/derive-encode/src/lib.rs
index 7820bba9..e03926b9 100644
--- a/derive-encode/src/lib.rs
+++ b/derive-encode/src/lib.rs
@@ -61,7 +61,7 @@ pub fn derive_encode(input: TokenStream) -> TokenStream {
         syn::Data::Union(_) => panic!("Can not derive Encode for union."),
     };
 
-    let mut gen = quote! {
+    let gen = quote! {
         impl prometheus_client::encoding::text::Encode for #name {
             fn encode(&self, writer: &mut dyn std::io::Write) -> std::result::Result<(), std::io::Error> {
                 #body
@@ -71,18 +71,20 @@ pub fn derive_encode(input: TokenStream) -> TokenStream {
         }
     };
 
-    if cfg!(feature = "protobuf") {
+    #[cfg(feature = "protobuf")]
+    let gen = {
         let protobuf = derive_protobuf_encode(ast);
-        gen = quote! {
+        quote! {
             #gen
 
             #protobuf
         }
-    }
+    };
 
     gen.into()
 }
 
+#[cfg(feature = "protobuf")]
 fn derive_protobuf_encode(ast: DeriveInput) -> TokenStream2 {
     let name = &ast.ident;
 
diff --git a/derive-encode/tests/lib.rs b/derive-encode/tests/lib.rs
index 230e9c8e..77bc322f 100644
--- a/derive-encode/tests/lib.rs
+++ b/derive-encode/tests/lib.rs
@@ -1,4 +1,5 @@
 use prometheus_client::encoding::text::{encode, Encode};
+use prometheus_client::encoding::Encode;
 use prometheus_client::metrics::counter::Counter;
 use prometheus_client::metrics::family::Family;
 use prometheus_client::registry::Registry;