diff --git a/packages/react-router/tsdown.config.rsc.ts b/packages/react-router/tsdown.config.rsc.ts
index af71f622a1..2ccff9cda3 100644
--- a/packages/react-router/tsdown.config.rsc.ts
+++ b/packages/react-router/tsdown.config.rsc.ts
@@ -25,7 +25,7 @@ const config = (enableDevWarnings: boolean): UserConfig => ({
     js: createBanner(pkg.name, pkg.version),
   },
   define: {
-    REACT_ROUTER_VERSION: JSON.stringify(pkg.version),
+    REACT_ROUTER_VERSION: JSON.stringify(pkg.version.split(".")[0]),
     __DEV__: JSON.stringify(enableDevWarnings),
   },
   treeshake: true,
diff --git a/packages/react-router/tsdown.config.ts b/packages/react-router/tsdown.config.ts
index 52659a1b2c..33ba60db55 100644
--- a/packages/react-router/tsdown.config.ts
+++ b/packages/react-router/tsdown.config.ts
@@ -36,7 +36,7 @@ const config = (enableDevWarnings: boolean): UserConfig => ({
     js: createBanner(pkg.name, pkg.version),
   },
   define: {
-    REACT_ROUTER_VERSION: JSON.stringify(pkg.version),
+    REACT_ROUTER_VERSION: JSON.stringify(pkg.version.split(".")[0]),
     __DEV__: JSON.stringify(enableDevWarnings),
   },
 });