diff --git a/arrays-and-slices.md b/arrays-and-slices.md
index 1e785be26..a6cb682c9 100644
--- a/arrays-and-slices.md
+++ b/arrays-and-slices.md
@@ -27,7 +27,7 @@ func TestSum(t *testing.T) {
     got := Sum(numbers)
     want := 15
 
-    if want != got {
+    if got != want {
         t.Errorf("got %d want %d given, %v", got, want, numbers)
     }
 }