diff --git a/libraries/o-error/http.js b/libraries/o-error/http.js
index e6c1bd5a0b..f5e03ec05f 100644
--- a/libraries/o-error/http.js
+++ b/libraries/o-error/http.js
@@ -1,8 +1,8 @@
 const OError = require('./index')
 
 class HttpError extends OError {
-  constructor(options) {
-    super(options)
+  constructor({ message, info, ...options }) {
+    super(message, info)
     this.statusCode = options.statusCode || 500
   }
 }
diff --git a/libraries/o-error/index.js b/libraries/o-error/index.js
index f7259b177e..7e4e48abda 100644
--- a/libraries/o-error/index.js
+++ b/libraries/o-error/index.js
@@ -21,7 +21,7 @@ class OError extends Error {
    * @param {string} message as for built-in Error
    * @param {?object} info extra data to attach to the error
    */
-  constructor({ message, info }) {
+  constructor(message, info) {
     super(message)
     this.name = this.constructor.name
     if (info) {
diff --git a/libraries/o-error/test/http.test.js b/libraries/o-error/test/http.test.js
index 1d1bac0035..210ee535b3 100644
--- a/libraries/o-error/test/http.test.js
+++ b/libraries/o-error/test/http.test.js
@@ -1,12 +1,22 @@
-const OError = require('..')
 const HttpErrors = require('../http')
 
+const { expectError } = require('./support')
+
 describe('OError/http', function () {
-  it('is instance of OError', function () {
-    try {
+  it('is a valid OError', function () {
+    function foo() {
       throw new HttpErrors.ConflictError()
-    } catch (e) {
-      expect(e).to.be.instanceof(OError)
+    }
+
+    try {
+      foo()
+    } catch (error) {
+      expectError(error, {
+        name: 'ConflictError',
+        klass: HttpErrors.ConflictError,
+        message: 'ConflictError: Conflict',
+        firstFrameRx: /foo/,
+      })
     }
   })
 
diff --git a/libraries/o-error/test/o-error.test.js b/libraries/o-error/test/o-error.test.js
index 897b8b0d62..86bb6703b7 100644
--- a/libraries/o-error/test/o-error.test.js
+++ b/libraries/o-error/test/o-error.test.js
@@ -2,14 +2,14 @@ const OError = require('..')
 const { expectError } = require('./support')
 
 class CustomError1 extends OError {
-  constructor(options) {
-    super({ message: 'failed to foo', ...options })
+  constructor(info) {
+    super('failed to foo', info)
   }
 }
 
 class CustomError2 extends OError {
-  constructor(options) {
-    super({ message: 'failed to bar', ...options })
+  constructor(customMessage, info) {
+    super(customMessage || 'failed to bar', info)
   }
 }
 
@@ -23,7 +23,7 @@ describe('OError', function () {
       try {
         doSomethingBadInternally()
       } catch (err) {
-        throw new CustomError1({ info: { userId: 123 } }).withCause(err)
+        throw new CustomError1({ userId: 123 }).withCause(err)
       }
     }
 
@@ -55,7 +55,7 @@ describe('OError', function () {
       try {
         doSomethingBadInternally()
       } catch (err) {
-        throw new CustomError2({ info: { database: 'a' } }).withCause(err)
+        throw new CustomError2('failed to bar!', { inner: 'a' }).withCause(err)
       }
     }
 
@@ -63,7 +63,7 @@ describe('OError', function () {
       try {
         doBar()
       } catch (err) {
-        throw new CustomError1({ info: { userId: 123 } }).withCause(err)
+        throw new CustomError1({ userId: 123 }).withCause(err)
       }
     }
 
@@ -74,19 +74,19 @@ describe('OError', function () {
       expectError(e, {
         name: 'CustomError1',
         klass: CustomError1,
-        message: 'CustomError1: failed to foo: failed to bar: internal error',
+        message: 'CustomError1: failed to foo: failed to bar!: internal error',
         firstFrameRx: /doFoo/,
       })
       expect(OError.getFullInfo(e)).to.deep.equal({
         userId: 123,
-        database: 'a',
+        inner: 'a',
       })
       const fullStack = OError.getFullStack(e)
       expect(fullStack).to.match(
-        /^CustomError1: failed to foo: failed to bar: internal error$/m
+        /^CustomError1: failed to foo: failed to bar!: internal error$/m
       )
       expect(fullStack).to.match(
-        /^caused by: CustomError2: failed to bar: internal error$/m
+        /^caused by: CustomError2: failed to bar!: internal error$/m
       )
       expect(fullStack).to.match(/^caused by: Error: internal error$/m)
     }
@@ -94,7 +94,7 @@ describe('OError', function () {
 
   it('handles a custom error without info', function () {
     try {
-      throw new CustomError1({})
+      throw new CustomError1()
     } catch (e) {
       expect(OError.getFullInfo(e)).to.deep.equal({})
       const infoKey = Object.keys(e).find((k) => k === 'info')