diff --git a/artificial_bee_colony/src/utils.rs b/artificial_bee_colony/src/utils.rs
index 7bccc02..c9501e9 100644
--- a/artificial_bee_colony/src/utils.rs
+++ b/artificial_bee_colony/src/utils.rs
@@ -212,7 +212,7 @@ fn standard_deviation(results: &[f64], arithmetic_mean: f64) -> f64 {
             .iter()
             .map(|function_result| (function_result - arithmetic_mean).powi(2))
             .sum::<f64>()
-            / (results.len() - 1) as f64,
+            / results.len() as f64,
     )
 }