diff --git a/Stream.xcodeproj/project.pbxproj b/Stream.xcodeproj/project.pbxproj
index c811dda..4030883 100644
--- a/Stream.xcodeproj/project.pbxproj
+++ b/Stream.xcodeproj/project.pbxproj
@@ -479,6 +479,7 @@
 				PRODUCT_NAME = Stream;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				VALID_ARCHS = x86_64;
 			};
 			name = Debug;
 		};
@@ -499,6 +500,7 @@
 				MACOSX_DEPLOYMENT_TARGET = 10.9;
 				PRODUCT_NAME = Stream;
 				SKIP_INSTALL = YES;
+				VALID_ARCHS = x86_64;
 			};
 			name = Release;
 		};