diff --git a/TZStackView.xcodeproj/project.pbxproj b/TZStackView.xcodeproj/project.pbxproj
index b9e35a1..96ffce4 100644
--- a/TZStackView.xcodeproj/project.pbxproj
+++ b/TZStackView.xcodeproj/project.pbxproj
@@ -508,6 +508,7 @@
 		A45441C91B9B6D71002452BA /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEBUG_INFORMATION_FORMAT = dwarf;
@@ -532,6 +533,7 @@
 		A45441CA1B9B6D71002452BA /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;