diff --git a/strategy/filter.go b/strategy/filter.go
index d97e74ae..9bb06504 100644
--- a/strategy/filter.go
+++ b/strategy/filter.go
@@ -8,7 +8,7 @@ import (
 type FilterConfig map[string][]string
 
 func ParseFilter(config FilterConfig) (IFilter, error) {
-	fs := make(Filters, len(config))
+	fs := make(Filters, 0, len(config))
 	for name, patterns := range config {
 
 		if len(patterns) == 0 {