diff --git a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
index 392f9ea..d005db9 100644
--- a/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
+++ b/Socket.IO-Client-Swift.xcodeproj/project.pbxproj
@@ -814,6 +814,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -870,6 +871,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;