diff --git a/Cargo.lock b/Cargo.lock
index ba7c894604..6b491ac095 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1261,6 +1261,7 @@ dependencies = [
  "pin-project",
  "reqwest",
  "serde",
+ "serde_json",
  "tokio",
  "tokio-util",
 ]
diff --git a/cli/tests/unit/fetch_test.ts b/cli/tests/unit/fetch_test.ts
index b4d2484409..bd105cb3f0 100644
--- a/cli/tests/unit/fetch_test.ts
+++ b/cli/tests/unit/fetch_test.ts
@@ -1159,6 +1159,16 @@ Deno.test(
   },
 );
 
+Deno.test(
+  { permissions: { net: true, read: true } },
+  function createHttpClientAcceptPoolIdleTimeout() {
+    const client = Deno.createHttpClient({
+      poolIdleTimeout: 1000,
+    });
+    client.close();
+  },
+);
+
 Deno.test(
   { permissions: { net: true } },
   async function fetchCustomClientUserAgent(): Promise<
diff --git a/ext/fetch/Cargo.toml b/ext/fetch/Cargo.toml
index af4af29a64..2e3283b085 100644
--- a/ext/fetch/Cargo.toml
+++ b/ext/fetch/Cargo.toml
@@ -23,5 +23,6 @@ http_v02.workspace = true
 pin-project.workspace = true
 reqwest.workspace = true
 serde.workspace = true
+serde_json.workspace = true
 tokio.workspace = true
 tokio-util = { workspace = true, features = ["io"] }
diff --git a/ext/fetch/lib.rs b/ext/fetch/lib.rs
index 6a2ac2ef98..ee8f30b59b 100644
--- a/ext/fetch/lib.rs
+++ b/ext/fetch/lib.rs
@@ -789,13 +789,6 @@ impl HttpClientResource {
   }
 }
 
-#[derive(Deserialize, Debug, Clone)]
-#[serde(rename_all = "camelCase")]
-pub enum PoolIdleTimeout {
-  State(bool),
-  Specify(u64),
-}
-
 #[derive(Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
 pub struct CreateHttpClientArgs {
@@ -804,7 +797,7 @@ pub struct CreateHttpClientArgs {
   cert_chain: Option<String>,
   private_key: Option<String>,
   pool_max_idle_per_host: Option<usize>,
-  pool_idle_timeout: Option<PoolIdleTimeout>,
+  pool_idle_timeout: Option<serde_json::Value>,
   #[serde(default = "default_true")]
   http1: bool,
   #[serde(default = "default_true")]
@@ -867,9 +860,12 @@ where
       pool_max_idle_per_host: args.pool_max_idle_per_host,
       pool_idle_timeout: args.pool_idle_timeout.and_then(
         |timeout| match timeout {
-          PoolIdleTimeout::State(true) => None,
-          PoolIdleTimeout::State(false) => Some(None),
-          PoolIdleTimeout::Specify(specify) => Some(Some(specify)),
+          serde_json::Value::Bool(true) => None,
+          serde_json::Value::Bool(false) => Some(None),
+          serde_json::Value::Number(specify) => {
+            Some(Some(specify.as_u64().unwrap_or_default()))
+          }
+          _ => Some(None),
         },
       ),
       http1: args.http1,