diff --git a/stdlib/private/StdlibUnittest/StdlibUnittest.swift.gyb b/stdlib/private/StdlibUnittest/StdlibUnittest.swift.gyb
index 04d35143eb7..6ebdfcaf626 100644
--- a/stdlib/private/StdlibUnittest/StdlibUnittest.swift.gyb
+++ b/stdlib/private/StdlibUnittest/StdlibUnittest.swift.gyb
@@ -268,7 +268,7 @@ public func expectGE(lhs: Int, _ rhs: Int, ${TRACE}) {
 public func expectType<T>(_: T.Type, inout _ x: T) {}
 public func expectEqualType<T>(_: T.Type, _: T.Type) {}
 
-public func isSequenceType<
+public func expectSequenceType<
   X : SequenceType
   where
   X.SubSequence : SequenceType,
diff --git a/test/1_stdlib/NSEnumeratorAPI.swift b/test/1_stdlib/NSEnumeratorAPI.swift
index 93388bc0989..c9056b07b7b 100644
--- a/test/1_stdlib/NSEnumeratorAPI.swift
+++ b/test/1_stdlib/NSEnumeratorAPI.swift
@@ -10,7 +10,7 @@ var NSEnumeratorAPI = TestSuite("NSEnumeratorAPI")
 
 NSEnumeratorAPI.test("SequenceType") {
   let result = NSDictionary().keyEnumerator()
-  isSequenceType(result)
+  expectSequenceType(result)
 }
 
 NSEnumeratorAPI.test("keyEnumerator") {
diff --git a/test/1_stdlib/NSSetAPI.swift b/test/1_stdlib/NSSetAPI.swift
index a55526fe642..ec7f6fa1e99 100644
--- a/test/1_stdlib/NSSetAPI.swift
+++ b/test/1_stdlib/NSSetAPI.swift
@@ -10,7 +10,7 @@ var NSSetAPI = TestSuite("NSSetAPI")
 
 NSSetAPI.test("SequenceType") {
   let result = NSSet()
-  isSequenceType(result)
+  expectSequenceType(result)
 }
 
 private func compareAnythingAtAll(x: AnyObject, y: AnyObject)
@@ -43,7 +43,7 @@ var NSOrderedSetAPI = TestSuite("NSOrderedSetAPI")
 
 NSOrderedSetAPI.test("SequenceType") {
   let result = NSOrderedSet()
-  isSequenceType(result)
+  expectSequenceType(result)
 }
 
 NSOrderedSetAPI.test("initWithObjects") {
@@ -74,7 +74,7 @@ var NSIndexSetAPI = TestSuite("NSIndexSetAPI")
 
 NSIndexSetAPI.test("SequenceType") {
   let result = NSIndexSet()
-  isSequenceType(result)
+  expectSequenceType(result)
   let s = NSIndexSet(indexesInRange: NSMakeRange(1, 1))
   var g = s.generate()
   // FIXME: Compiler doesn't accept these terms.