diff --git a/src/types.js b/src/types.js
index 9ee5c6f..038d9b3 100644
--- a/src/types.js
+++ b/src/types.js
@@ -23,7 +23,6 @@ function UInt53 (value) {
 
 // external dependent types
 var BigInt = typeforce.quacksLike('BigInteger')
-var ECCurve = typeforce.quacksLike('Curve')
 var ECPoint = typeforce.quacksLike('Point')
 
 // exposed, external API
@@ -44,7 +43,6 @@ var Network = typeforce.compile({
 var types = {
   BigInt: BigInt,
   Buffer256bit: Buffer256bit,
-  ECCurve: ECCurve,
   ECPoint: ECPoint,
   ECSignature: ECSignature,
   Hash160bit: Hash160bit,
diff --git a/test/types.js b/test/types.js
index 9691d53..9556927 100644
--- a/test/types.js
+++ b/test/types.js
@@ -4,11 +4,15 @@ var assert = require('assert')
 var types = require('../src/types')
 
 describe('types', function () {
-  describe('ECCurve/ECPoint/BigInt', function () {
+  describe('BigInt/ECPoint', function () {
     it('return true for duck types', function () {
-      assert(types.quacksLike('BigInteger', function BigInteger () {}))
-      assert(types.quacksLike('Curve', function Curve () {}))
-      assert(types.quacksLike('Point', function Point () {}))
+      assert(types.BigInt(new function BigInteger () {}))
+      assert(types.ECPoint(new function Point () {}))
+    })
+
+    it('return false for bad types', function () {
+      assert(!types.BigInt(new function NotABigInteger () {}))
+      assert(!types.ECPoint(new function NotAPoint () {}))
     })
   })
 })