diff --git a/terraform/diff.go b/terraform/diff.go
index ae2618316..c8e660ad5 100644
--- a/terraform/diff.go
+++ b/terraform/diff.go
@@ -595,19 +595,11 @@ func (d *InstanceDiff) applyCollectionDiff(attrName string, oldAttrs map[string]
 		idx = attrName + ".%"
 	}
 
-	// record if we got the index from the diff
-	setIndex := false
-
 	for k := range keys {
 		if !strings.HasPrefix(k, attrName+".") {
 			continue
 		}
 
-		// we need to verify if we saw the index later
-		if k == idx {
-			setIndex = true
-		}
-
 		res, err := d.applyAttrDiff(k, oldAttrs, attrSchema)
 		if err != nil {
 			return result, err