diff --git a/src/components/reviews/ReviewForm.tsx b/src/components/reviews/ReviewForm.tsx
index 2f9ae68b..c89592e5 100644
--- a/src/components/reviews/ReviewForm.tsx
+++ b/src/components/reviews/ReviewForm.tsx
@@ -19,7 +19,14 @@ const reviewSchema = z.object({
   title: z.string().optional(),
   content: z.string().min(10, 'Review must be at least 10 characters long'),
   visit_date: z.string().optional(),
-  wait_time_minutes: z.number().optional(),
+  wait_time_minutes: z.preprocess(
+    (val) => {
+      if (val === '' || val === null || val === undefined) return undefined;
+      const num = Number(val);
+      return isNaN(num) ? undefined : num;
+    },
+    z.number().positive().optional()
+  ),
   photos: z.array(z.string()).optional()
 });
 type ReviewFormData = z.infer<typeof reviewSchema>;