diff --git a/packages/clients/src/helpers/__tests__/marshalling.ts b/packages/clients/src/helpers/__tests__/marshalling.ts
index c17bda431..b51702037 100644
--- a/packages/clients/src/helpers/__tests__/marshalling.ts
+++ b/packages/clients/src/helpers/__tests__/marshalling.ts
@@ -158,6 +158,18 @@ describe('resolveOneOf', () => {
       ),
     ).toStrictEqual({})
   })
+
+  it('handles false kind values, like boolean.false', () => {
+    expect(
+      resolveOneOf(
+        [
+          { default: undefined, param: 'my_key_1', value: false },
+          { default: undefined, param: 'my_key_2', value: true },
+        ],
+        false,
+      ),
+    ).toStrictEqual({ my_key_1: false })
+  })
 })
 
 describe('unmarshalDate', () => {
diff --git a/packages/clients/src/helpers/marshalling.ts b/packages/clients/src/helpers/marshalling.ts
index c7bc0dd00..f6c3d0fb5 100644
--- a/packages/clients/src/helpers/marshalling.ts
+++ b/packages/clients/src/helpers/marshalling.ts
@@ -41,9 +41,14 @@ export const resolveOneOf = <T>(
   }[],
   isRequired = false,
 ): Record<string, T> => {
-  const elt = list.find(obj => obj.value) || list.find(obj => obj.default)
-  const value = elt?.value || elt?.default
-  if (value) return { [elt.param]: value }
+  const elt =
+    list.find(obj => obj.value !== undefined) ??
+    list.find(obj => obj.default !== undefined)
+  const value = elt?.value ?? elt?.default
+  if (elt && value !== undefined) {
+    return { [elt.param]: value }
+  }
+
   if (isRequired) {
     const keyList = list.map(obj => obj.param).join(' or ')
     throw new TypeError(`one of ${keyList} must be indicated in the request`)