diff --git a/Cargo.toml b/Cargo.toml
index 61a285ef2f..68835c82e6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,13 +28,13 @@ http-body = "=1.0.0-rc.2"
 http-body-util = { version = "=0.1.0-rc.3", optional = true }
 httparse = "1.8"
 h2 = { version = "0.3.9", optional = true }
-itoa = "1"
 pin-project-lite = "0.2.4"
 tokio = { version = "1", features = ["sync"] }
 
 # Optional
 
 httpdate = { version = "1.0", optional = true }
+itoa = { version = "1", optional = true }
 libc = { version = "0.2", optional = true }
 tracing = { version = "0.1", default-features = false, features = ["std"], optional = true }
 want = { version = "0.3", optional = true }
@@ -74,7 +74,7 @@ full = [
 ]
 
 # HTTP versions
-http1 = []
+http1 = ["dep:itoa"]
 http2 = ["dep:h2"]
 
 # Client/Server