diff --git a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
index 73cd272..3315a7a 100644
--- a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
+++ b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
@@ -535,6 +535,7 @@
 		572EF2121B51F12F00EEBB58 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CODE_SIGN_IDENTITY = "Developer ID Application";
 				GCC_OPTIMIZATION_LEVEL = 0;
 				PRODUCT_NAME = SocketIO;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -544,6 +545,7 @@
 		572EF2131B51F12F00EEBB58 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CODE_SIGN_IDENTITY = "Developer ID Application";
 				PRODUCT_NAME = SocketIO;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 			};