diff --git a/association.go b/association.go
index 4d3fb15f..342dd6cd 100644
--- a/association.go
+++ b/association.go
@@ -230,7 +230,7 @@ func toQueryMarks(primaryValues [][]interface{}) string {
 
 	for _, primaryValue := range primaryValues {
 		var marks []string
-		for range primaryValue {
+		for _,_ = range primaryValue {
 			marks = append(marks, "?")
 		}