diff --git a/.changeset/rich-horses-dress.md b/.changeset/rich-horses-dress.md
new file mode 100644
index 0000000000..8847a92f7a
--- /dev/null
+++ b/.changeset/rich-horses-dress.md
@@ -0,0 +1,5 @@
+---
+"@heroui/system-rsc": patch
+---
+
+fix extendVariants return type error(#5778)
diff --git a/packages/core/system-rsc/src/extend-variants.d.ts b/packages/core/system-rsc/src/extend-variants.d.ts
index 2dceadae6d..afd764b77f 100644
--- a/packages/core/system-rsc/src/extend-variants.d.ts
+++ b/packages/core/system-rsc/src/extend-variants.d.ts
@@ -103,11 +103,11 @@ export type ExtendVariants = {
     },
     opts?: Options,
   ): ForwardRefExoticComponent<
-    PropsWithoutRef<
-      CP & {
-        [key in keyof V]?: StringToBoolean<keyof V[key]>;
-      }
-    > &
+    PropsWithoutRef<{
+      [key in keyof CP | keyof V]?:
+        | (key extends keyof CP ? CP[key] : never)
+        | (key extends keyof V ? StringToBoolean<keyof V[key]> : never);
+    }> &
       RefAttributes<InferRef<C>>
   >;
 };