diff --git a/lib/validate.js b/lib/validate.js
index a5d930b9..cb52cdb4 100644
--- a/lib/validate.js
+++ b/lib/validate.js
@@ -585,17 +585,25 @@ export const amountSchema = object({
   amount: intValidator.required('required').positive('must be positive')
 })
 
+export const boostValidator = intValidator
+  .min(BOOST_MULT, `must be at least ${BOOST_MULT}`).test({
+    name: 'boost',
+    test: async boost => boost % BOOST_MULT === 0,
+    message: `must be divisble be ${BOOST_MULT}`
+  })
+
 export const boostSchema = object({
-  amount: intValidator
-    .min(BOOST_MULT, `must be at least ${BOOST_MULT}`).test({
-      name: 'boost',
-      test: async boost => boost % BOOST_MULT === 0,
-      message: `must be divisble be ${BOOST_MULT}`
-    })
+  amount: boostValidator.required('required').positive('must be positive')
 })
 
 export const actSchema = object({
-  sats: intValidator.required('required').positive('must be positive'),
+  sats: intValidator.required('required').positive('must be positive')
+    .when(['act'], ([act], schema) => {
+      if (act === 'BOOST') {
+        return boostValidator
+      }
+      return schema
+    }),
   act: string().required('required').oneOf(['TIP', 'DONT_LIKE_THIS', 'BOOST'])
 })