diff --git a/BezierKit/BezierKit.xcodeproj/xcshareddata/xcschemes/BezierKit_iOS.xcscheme b/BezierKit/BezierKit.xcodeproj/xcshareddata/xcschemes/BezierKit_iOS.xcscheme
index 16804bf6..57661a62 100644
--- a/BezierKit/BezierKit.xcodeproj/xcshareddata/xcschemes/BezierKit_iOS.xcscheme
+++ b/BezierKit/BezierKit.xcodeproj/xcshareddata/xcschemes/BezierKit_iOS.xcscheme
@@ -42,6 +42,9 @@
                <Test
                   Identifier = "PathTests/testCrossingsRemovedAnotherRealWorldCase()">
                </Test>
+               <Test
+                  Identifier = "PathTests/testSubtractionPerformance()">
+               </Test>
             </SkippedTests>
          </TestableReference>
       </Testables>
diff --git a/BezierKit/BezierKitTests/Path+DataTests.swift b/BezierKit/BezierKitTests/Path+DataTests.swift
index 263ae75e..f6ff43b2 100644
--- a/BezierKit/BezierKitTests/Path+DataTests.swift
+++ b/BezierKit/BezierKitTests/Path+DataTests.swift
@@ -26,6 +26,8 @@ private struct CGPathElementRecord: Equatable {
                 return 3
             case .closeSubpath:
                 return 0
+            @unknown default:
+                fatalError("unexpected unknown path element type: \(pathElement.type)")
             }
         }()
         self.pointsArray = [CGPoint](UnsafeBufferPointer(start: pathElement.points, count: count))
@@ -172,7 +174,7 @@ class PathDataTests: XCTestCase {
     func testWrongMagicNumber() {
         var data = simpleRectangle.data
         XCTAssertNotEqual(Path(data: data), nil)
-        data.withUnsafeMutableBytes { (bytes: UnsafeMutablePointer<UInt8>) in
+        data.withUnsafeMutableBytes { (bytes: UnsafeMutableRawBufferPointer) in
             bytes[0] = ~bytes[0]
         }
         XCTAssertEqual(Path(data: data), nil)