diff --git a/iphone/CoreApi/CoreApi.xcodeproj/project.pbxproj b/iphone/CoreApi/CoreApi.xcodeproj/project.pbxproj
index 7d28f25775..459a51a4c3 100644
--- a/iphone/CoreApi/CoreApi.xcodeproj/project.pbxproj
+++ b/iphone/CoreApi/CoreApi.xcodeproj/project.pbxproj
@@ -702,8 +702,6 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SKIP_INSTALL = YES;
-				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 6.0;
 			};
 			name = Debug;
 		};
@@ -729,7 +727,6 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 6.0;
 			};
 			name = Release;
 		};