diff --git a/documentation/current/examples/example-sieve-eratosthenes.wiki b/documentation/current/examples/example-sieve-eratosthenes.wiki
index 10a9a091..5904cdf2 100644
--- a/documentation/current/examples/example-sieve-eratosthenes.wiki
+++ b/documentation/current/examples/example-sieve-eratosthenes.wiki
@@ -45,7 +45,7 @@ feature
             loop
                 if ic.item then
                     Result.extend (ic.target_index)
-                    across ((ic.target_index + ic.target_index) |..| l_tab.upper).new_cursor.with_step (ic.target_index) as id
+                    across ((ic.target_index * ic.target_index) |..| l_tab.upper).new_cursor.with_step (ic.target_index) as id
                     loop
                         l_tab [id.item] := False
                     end