diff --git a/04-fibonacci/index.js b/04-fibonacci/index.js
index 37c64cc..d45f82c 100644
--- a/04-fibonacci/index.js
+++ b/04-fibonacci/index.js
@@ -1,4 +1,4 @@
 export function fibonacci(value) {
   // implementar logica aqui
-  
+  return value <= 1 ? value : fibonacci(value - 1) + fibonacci(value - 2);
 }
\ No newline at end of file