diff --git a/xcode/commonFastfile b/xcode/commonFastfile
index 0cea863..2ad35d9 100644
--- a/xcode/commonFastfile
+++ b/xcode/commonFastfile
@@ -364,13 +364,23 @@ def set_xcconfig_for_configuration_of_project(xcconfig_name, configuration_name,
 
   project = Xcodeproj::Project.open(xcodeproj_path)
 
-  is_app_target = lambda { |t| !t.test_target_type? && t.product_type == Xcodeproj::Constants::PRODUCT_TYPE_UTI[:application] }
-  application_target = project.native_targets.select(&is_app_target).first
-  build_configuration = application_target.build_configuration_list[configuration_name]
+  target_to_modify_selector = lambda do |t| 
+    supported_product_types = [
+        Xcodeproj::Constants::PRODUCT_TYPE_UTI[:application]
+        Xcodeproj::Constants::PRODUCT_TYPE_UTI[:app_extension]
+    ]
+    return !t.test_target_type? && supported_product_types.include?(t.product_type)
+end
 
-  build_configuration_reference = project.files.select { |f| f.path.start_with?(xcconfig_name) }.first
+  application_targets = project.native_targets.select(&target_to_modify_selector)
+
+  application_targets.each do |target|
+    build_configuration = target.build_configuration_list[configuration_name]
+    config_name = target.name + xcconfig_name
+    build_configuration_reference = project.files.select { |f| f.path.start_with?(config_name) }.first
+    build_configuration.base_configuration_reference = build_configuration_reference
+  end
 
-  build_configuration.base_configuration_reference = build_configuration_reference
 
   project.save()
 end