diff --git a/packages/governance/src/committee.js b/packages/governance/src/committee.js
index 96e68d61ae6..17d496dc928 100644
--- a/packages/governance/src/committee.js
+++ b/packages/governance/src/committee.js
@@ -5,6 +5,7 @@ import { E } from '@endo/eventual-send';
 
 import { StorageNodeShape } from '@agoric/internal';
 import { prepareExo, provideDurableMapStore } from '@agoric/vat-data';
+import { EmptyProposalShape } from '@agoric/zoe/src/typeGuards.js';
 import {
   getOpenQuestions,
   getPoserInvitation,
@@ -79,10 +80,15 @@ export const start = (zcf, privateArgs, baggage) => {
     // This will produce unique descriptions because
     // makeCommitteeVoterInvitation() is only called within the following loop,
     // which is only called once per Electorate.
-    return zcf.makeInvitation(seat => {
-      seat.exit();
-      return makeVoterKit(index);
-    }, `Voter${index}`);
+    return zcf.makeInvitation(
+      seat => {
+        seat.exit();
+        return makeVoterKit(index);
+      },
+      `Voter${index}`,
+      undefined,
+      EmptyProposalShape,
+    );
   };
 
   const { committeeName, committeeSize } = zcf.getTerms();
diff --git a/packages/governance/src/electorateTools.js b/packages/governance/src/electorateTools.js
index 5d2f000977d..11ea8355fa5 100644
--- a/packages/governance/src/electorateTools.js
+++ b/packages/governance/src/electorateTools.js
@@ -1,3 +1,4 @@
+import { EmptyProposalShape } from '@agoric/zoe/src/typeGuards.js';
 import { E } from '@endo/eventual-send';
 import { deeplyFulfilled, Far } from '@endo/marshal';
 
@@ -95,7 +96,12 @@ const getPoserInvitation = (zcf, addQuestion) => {
     seat.exit();
     return Far(`questionPoser`, { addQuestion });
   };
-  return zcf.makeInvitation(questionPoserHandler, `questionPoser`);
+  return zcf.makeInvitation(
+    questionPoserHandler,
+    `questionPoser`,
+    undefined,
+    EmptyProposalShape,
+  );
 };
 
 harden(startCounter);
diff --git a/packages/governance/src/noActionElectorate.js b/packages/governance/src/noActionElectorate.js
index 7f39dfa00a7..b18314f99d8 100644
--- a/packages/governance/src/noActionElectorate.js
+++ b/packages/governance/src/noActionElectorate.js
@@ -1,6 +1,7 @@
 import { makePublishKit } from '@agoric/notifier';
 import { makePromiseKit } from '@endo/promise-kit';
 import { makeExo } from '@agoric/store';
+import { EmptyProposalShape } from '@agoric/zoe/src/typeGuards.js';
 
 import { ElectoratePublicI, ElectorateCreatorI } from './typeGuards.js';
 
@@ -40,6 +41,8 @@ const start = zcf => {
       return zcf.makeInvitation(
         () => {},
         `noActionElectorate doesn't allow posing questions`,
+        undefined,
+        EmptyProposalShape,
       );
     },
     addQuestion(_instance, _question) {
diff --git a/packages/zoe/src/typeGuards.js b/packages/zoe/src/typeGuards.js
index a5264eb2e19..32d8ff209fe 100644
--- a/packages/zoe/src/typeGuards.js
+++ b/packages/zoe/src/typeGuards.js
@@ -90,6 +90,12 @@ export const FullProposalShape = harden({
 /** @see {Proposal} type */
 export const ProposalShape = M.splitRecord({}, FullProposalShape, {});
 
+export const EmptyProposalShape = M.splitRecord({
+  give: {},
+  want: {},
+  exit: { onDemand: null },
+});
+
 export const isOnDemandExitRule = exit => {
   const [exitKey] = Object.keys(exit);
   return exitKey === 'onDemand';