diff --git a/akka-docs/intro/getting-started-first-scala.rst b/akka-docs/intro/getting-started-first-scala.rst
index 17c4d265c4..d0c8e2c90e 100644
--- a/akka-docs/intro/getting-started-first-scala.rst
+++ b/akka-docs/intro/getting-started-first-scala.rst
@@ -238,7 +238,7 @@ The only thing missing in our ``Worker`` actor is the implementation on the ``ca
     def calculatePiFor(start: Int, nrOfElements: Int): Double = {
       var acc = 0.0
       for (i <- start until (start + nrOfElements))
-        acc += 4 * (1 - (i % 2) * 2) / (2 * i + 1)
+        acc += 4.0 * (1 - (i % 2) * 2) / (2 * i + 1)
       acc
     }