diff --git a/crates/pack-core/src/config.rs b/crates/pack-core/src/config.rs
index 8d7a28f5d2..382c533059 100644
--- a/crates/pack-core/src/config.rs
+++ b/crates/pack-core/src/config.rs
@@ -241,12 +241,19 @@ pub struct ExternalAdvanced {
     pub sub_path: Option<ExternalSubPath>,
 }
 
+#[turbo_tasks::value]
+#[derive(Clone, Debug, Deserialize, OperationValue)]
+#[serde(rename_all = "camelCase")]
+pub enum ReactRuntime {
+    Automatic,
+    Classic,
+}
+
 #[turbo_tasks::value(eq = "manual")]
 #[derive(Clone, Debug, PartialEq, Default, Deserialize, OperationValue)]
 #[serde(rename_all = "camelCase")]
 pub struct ReactConfig {
-    /// JSX runtime mode: "automatic" (default) or "classic"
-    pub runtime: Option<RcStr>,
+    pub runtime: Option<ReactRuntime>,
 }
 
 #[turbo_tasks::value(eq = "manual")]
diff --git a/crates/pack-core/src/transform_options.rs b/crates/pack-core/src/transform_options.rs
index ee54a29f2a..7d674bba4f 100644
--- a/crates/pack-core/src/transform_options.rs
+++ b/crates/pack-core/src/transform_options.rs
@@ -11,7 +11,10 @@ use turbopack_core::{
 };
 use turbopack_ecmascript::typescript::resolve::{read_from_tsconfigs, read_tsconfigs, tsconfig};
 
-use crate::{config::Config, mode::Mode};
+use crate::{
+    config::{Config, ReactRuntime},
+    mode::Mode,
+};
 
 async fn get_typescript_options(
     project_path: FileSystemPath,
@@ -133,7 +136,10 @@ pub async fn get_jsx_transform_options(
         } else {
             None
         },
-        runtime: react_config.runtime.clone().or(Some("automatic".into())),
+        runtime: react_config.runtime.as_ref().map(|runtime| match runtime {
+            ReactRuntime::Automatic => "automatic".into(),
+            ReactRuntime::Classic => "classic".into(),
+        }),
         react_refresh: enable_react_refresh,
     };
 
diff --git a/packages/pack-shared/src/config.ts b/packages/pack-shared/src/config.ts
index 2ebe834c38..da27f9bc52 100644
--- a/packages/pack-shared/src/config.ts
+++ b/packages/pack-shared/src/config.ts
@@ -189,6 +189,9 @@ export interface ConfigComplete {
   images?: {
     inlineLimit?: number;
   };
+  react?: {
+    runtime?: "automatic" | "classic";
+  };
   stats?: boolean;
   persistentCaching?: boolean;
   nodePolyfill?: boolean;