diff --git a/filtering.go b/filtering.go
index cf577dc..7eacd49 100644
--- a/filtering.go
+++ b/filtering.go
@@ -93,8 +93,8 @@ func MakeFilterString(prefix string, filters Filter, validFilters []string) (res
 		return "", false
 	}
 
+	first := true
 	for k, filter := range filters {
-		first := true
 		symbol := "="
 
 		if first {