diff --git a/Sources/SwiftyTimer.swift b/Sources/SwiftyTimer.swift
index 519e720..d281c7e 100644
--- a/Sources/SwiftyTimer.swift
+++ b/Sources/SwiftyTimer.swift
@@ -104,8 +104,8 @@ extension Timer {
     /// By default, the timer is scheduled on the current run loop for the default mode.
     /// Specify `runLoop` or `modes` to override these defaults.
     
-    public func start(runLoop: RunLoop = .current, modes: RunLoopMode...) {
-        let modes = modes.isEmpty ? [.defaultRunLoopMode] : modes
+    public func start(runLoop: RunLoop = .current, modes: RunLoop.Mode...) {
+        let modes = modes.isEmpty ? [RunLoop.Mode.default] : modes
         
         for mode in modes {
             runLoop.add(self, forMode: mode)
diff --git a/SwiftyTimer.xcodeproj/project.pbxproj b/SwiftyTimer.xcodeproj/project.pbxproj
index 70f8d1b..edd89b9 100644
--- a/SwiftyTimer.xcodeproj/project.pbxproj
+++ b/SwiftyTimer.xcodeproj/project.pbxproj
@@ -210,7 +210,7 @@
 				TargetAttributes = {
 					3E721ABA1BF7255D008AF027 = {
 						CreatedOnToolsVersion = 7.1;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 1000;
 					};
 					6E7E40891C84B1A20030CEBB = {
 						CreatedOnToolsVersion = 7.2;
@@ -425,6 +425,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = io.radex.SwiftyTimer;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -445,6 +447,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = io.radex.SwiftyTimer;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
diff --git a/SwiftyTimer.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/SwiftyTimer.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/SwiftyTimer.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>