diff --git a/terraform/context.go b/terraform/context.go
index 7f1502fa1e..7feaa408fe 100644
--- a/terraform/context.go
+++ b/terraform/context.go
@@ -1685,7 +1685,7 @@ func (c *walkContext) computeResourceMultiVariable(
 			v.FullKey())
 	}
 
-	return strings.Join(values, ","), nil
+	return strings.Join(values, config.InterpSplitDelim), nil
 }
 
 type walkInputMeta struct {