diff --git a/stdlib/public/core/Reflection.swift b/stdlib/public/core/Reflection.swift
index 4091109b6035a..795a4f72c47b6 100644
--- a/stdlib/public/core/Reflection.swift
+++ b/stdlib/public/core/Reflection.swift
@@ -48,7 +48,7 @@ extension ObjectIdentifier : CustomDebugStringConvertible {
 }
 
 public func <(lhs: ObjectIdentifier, rhs: ObjectIdentifier) -> Bool {
-  return UInt(lhs) < UInt(rhs)
+  return UInt(bitPattern: lhs) < UInt(bitPattern: rhs)
 }
 
 public func ==(x: ObjectIdentifier, y: ObjectIdentifier) -> Bool {
@@ -57,15 +57,15 @@ public func ==(x: ObjectIdentifier, y: ObjectIdentifier) -> Bool {
 
 extension UInt {
   /// Create a `UInt` that captures the full value of `objectID`.
-  public init(_ objectID: ObjectIdentifier) {
+  public init(bitPattern objectID: ObjectIdentifier) {
     self.init(Builtin.ptrtoint_Word(objectID._value))
   }
 }
 
 extension Int {
   /// Create an `Int` that captures the full value of `objectID`.
-  public init(_ objectID: ObjectIdentifier) {
-    self.init(bitPattern: UInt(objectID))
+  public init(bitPattern objectID: ObjectIdentifier) {
+    self.init(bitPattern: UInt(bitPattern: objectID))
   }
 }
 
@@ -631,3 +631,17 @@ extension ObjectIdentifier {
     Builtin.unreachable()
   }
 }
+
+extension UInt {
+  @available(*, unavailable, renamed: "init(bitPattern:)")
+  public init(_ objectID: ObjectIdentifier) {
+    Builtin.unreachable()
+  }
+}
+
+extension Int {
+  @available(*, unavailable, renamed: "init(bitPattern:)")
+  public init(_ objectID: ObjectIdentifier) {
+    Builtin.unreachable()
+  }
+}
diff --git a/test/1_stdlib/Runtime.swift.gyb b/test/1_stdlib/Runtime.swift.gyb
index 134dfb8039c18..1c137b4740f29 100644
--- a/test/1_stdlib/Runtime.swift.gyb
+++ b/test/1_stdlib/Runtime.swift.gyb
@@ -995,8 +995,11 @@ Reflection.test("ObjectIdentifier/CustomDebugStringConvertible") {
   expectEqual(String(reflecting: oi1), String(reflecting: oi1))
   expectNotEqual(String(reflecting: oi1), String(reflecting: oi2))
 
-  let p1 = UnsafePointer<Void>(bitPattern: UInt(oi1))!
+  let p1 = UnsafePointer<Void>(bitPattern: UInt(bitPattern: oi1))!
   expectPrinted("ObjectIdentifier(\(p1))", oi1)
+  let p2 = UnsafePointer<Void>(bitPattern: Int(bitPattern: oi1))!
+  expectPrinted("ObjectIdentifier(\(p2))", oi1)
+
 }
 
 Reflection.test("CustomMirrorIsInherited") {