diff --git a/internal/metricAggregator/metricAggregator.go b/internal/metricAggregator/metricAggregator.go
index 4c2d6b1..f69edfb 100644
--- a/internal/metricAggregator/metricAggregator.go
+++ b/internal/metricAggregator/metricAggregator.go
@@ -337,7 +337,9 @@ func (c *metricAggregator) DeleteAggregation(name string) error {
 	if i == -1 {
 		return fmt.Errorf("no aggregation for metric name %s", name)
 	}
-	c.functions = slices.Delete(c.functions, i, i)
+	copy(c.functions[i:], c.functions[i+1:])
+	c.functions[len(c.functions)-1] = nil
+	c.functions = c.functions[:len(c.functions)-1]
 	return nil
 }