diff --git a/packages/inter-protocol/src/price/fluxAggregatorKit.js b/packages/inter-protocol/src/price/fluxAggregatorKit.js
index 630fbe10a4c..70aea656f9e 100644
--- a/packages/inter-protocol/src/price/fluxAggregatorKit.js
+++ b/packages/inter-protocol/src/price/fluxAggregatorKit.js
@@ -213,7 +213,11 @@ export const prepareFluxAggregatorKit = async (
     baggage,
     'fluxAggregator',
     {
-      creator: M.interface('fluxAggregator creatorFacet', {}, { sloppy: true }),
+      creator: M.interface(
+        'fluxAggregator creatorFacet',
+        {},
+        { defaultGuards: 'passable' },
+      ),
       public: M.interface('fluxAggregator publicFacet', {
         getPriceAuthority: M.call().returns(M.any()),
         getPublicTopics: M.call().returns({
diff --git a/packages/inter-protocol/src/vaultFactory/vaultManager.js b/packages/inter-protocol/src/vaultFactory/vaultManager.js
index c4438b43fe1..4e74c82b419 100644
--- a/packages/inter-protocol/src/vaultFactory/vaultManager.js
+++ b/packages/inter-protocol/src/vaultFactory/vaultManager.js
@@ -310,9 +310,9 @@ export const prepareVaultManagerKit = (
       }),
       helper: M.interface(
         'helper',
-        // not exposed so sloppy okay
+        // not exposed so using `defaultGuards` is fine.
         {},
-        { sloppy: true },
+        { defaultGuards: 'passable' },
       ),
       manager: M.interface('manager', {
         getGovernedParams: M.call().returns(M.remotable('governedParams')),
diff --git a/packages/internal/src/typeGuards.js b/packages/internal/src/typeGuards.js
index fd44f74ffc5..f424aa7429e 100644
--- a/packages/internal/src/typeGuards.js
+++ b/packages/internal/src/typeGuards.js
@@ -9,8 +9,8 @@ export const StorageNodeShape = M.remotable('StorageNode');
 export const UnguardedHelperI = M.interface(
   'helper',
   {},
-  // not exposed so sloppy okay
-  { sloppy: true },
+  // not exposed so using `defaultGuards` is fine.
+  { defaultGuards: 'passable' },
 );
 
 /**
diff --git a/packages/zoe/src/contractFacet/zcfSeat.js b/packages/zoe/src/contractFacet/zcfSeat.js
index 5a3bfc996a4..20647945430 100644
--- a/packages/zoe/src/contractFacet/zcfSeat.js
+++ b/packages/zoe/src/contractFacet/zcfSeat.js
@@ -88,7 +88,7 @@ export const createSeatManager = (
     return activeZCFSeats.get(zcfSeat);
   };
 
-  const ZCFSeatI = M.interface('ZCFSeat', {}, { sloppy: true });
+  const ZCFSeatI = M.interface('ZCFSeat', {}, { defaultGuards: 'passable' });
 
   const makeZCFSeatInternal = prepareExoClass(
     zcfBaggage,