diff --git a/lib/types/index.js b/lib/types/index.js
index 538430db8..0fbf00484 100644
--- a/lib/types/index.js
+++ b/lib/types/index.js
@@ -578,7 +578,7 @@ export type GtfsSpecField = {
   helpContent?: string,
   inputType: InputType,
   name: string,
-  options?: Array<{text: string, value: string}>,
+  options?: Array<{text: string, value: string | number}>,
   placeholder?: string,
   required: boolean
 }