diff --git a/Sources/SwiftyTimer.swift b/Sources/SwiftyTimer.swift
index debd896..86a3f77 100644
--- a/Sources/SwiftyTimer.swift
+++ b/Sources/SwiftyTimer.swift
@@ -31,7 +31,7 @@ extension Timer {
     /// Create and schedule a timer that will call `block` once after the specified time.
     
     @discardableResult
-    public class func after(_ interval: TimeInterval, _ block: () -> Void) -> Timer {
+    public class func after(_ interval: TimeInterval, _ block: @escaping () -> Void) -> Timer {
         let timer = Timer.new(after: interval, block)
         timer.start()
         return timer
@@ -40,7 +40,7 @@ extension Timer {
     /// Create and schedule a timer that will call `block` repeatedly in specified time intervals.
     
     @discardableResult
-    public class func every(_ interval: TimeInterval, _ block: () -> Void) -> Timer {
+    public class func every(_ interval: TimeInterval, _ block: @escaping () -> Void) -> Timer {
         let timer = Timer.new(every: interval, block)
         timer.start()
         return timer
@@ -50,7 +50,7 @@ extension Timer {
     /// (This variant also passes the timer instance to the block)
     
     @nonobjc @discardableResult
-    public class func every(_ interval: TimeInterval, _ block: (Timer) -> Void) -> Timer {
+    public class func every(_ interval: TimeInterval, _ block: @escaping (Timer) -> Void) -> Timer {
         let timer = Timer.new(every: interval, block)
         timer.start()
         return timer
@@ -64,7 +64,7 @@ extension Timer {
     ///         Use `NSTimer.after` to create and schedule a timer in one step.
     /// - Note: The `new` class function is a workaround for a crashing bug when using convenience initializers (rdar://18720947)
 
-    public class func new(after interval: TimeInterval, _ block: () -> Void) -> Timer {
+    public class func new(after interval: TimeInterval, _ block: @escaping () -> Void) -> Timer {
         return CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent() + interval, 0, 0, 0) { _ in
             block()
         }
@@ -76,7 +76,7 @@ extension Timer {
     ///         Use `NSTimer.every` to create and schedule a timer in one step.
     /// - Note: The `new` class function is a workaround for a crashing bug when using convenience initializers (rdar://18720947)
 
-    public class func new(every interval: TimeInterval, _ block: () -> Void) -> Timer {
+    public class func new(every interval: TimeInterval, _ block: @escaping () -> Void) -> Timer {
         return CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent() + interval, interval, 0, 0) { _ in
             block()
         }
@@ -89,7 +89,7 @@ extension Timer {
     ///         Use `NSTimer.every` to create and schedule a timer in one step.
     /// - Note: The `new` class function is a workaround for a crashing bug when using convenience initializers (rdar://18720947)
     
-    @nonobjc public class func new(every interval: TimeInterval, _ block: (Timer) -> Void) -> Timer {
+    @nonobjc public class func new(every interval: TimeInterval, _ block: @escaping (Timer) -> Void) -> Timer {
         var timer: Timer!
         timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, CFAbsoluteTimeGetCurrent() + interval, interval, 0, 0) { _ in
             block(timer)
diff --git a/SwiftyTimerTests/SwiftyTimerTests/main.swift b/SwiftyTimerTests/SwiftyTimerTests/main.swift
index f808c8c..e67630f 100644
--- a/SwiftyTimerTests/SwiftyTimerTests/main.swift
+++ b/SwiftyTimerTests/SwiftyTimerTests/main.swift
@@ -74,7 +74,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
             self.test7()
         }
         
-        timer.start(runLoop: .current, modes: .defaultRunLoopMode, RunLoopMode(NSEventTrackingRunLoopMode))
+        timer.start(runLoop: .current, modes: .defaultRunLoopMode, .eventTrackingRunLoopMode)
     }
 
     func test7() {