diff --git a/mobile/fastlane/Fastfile b/mobile/fastlane/Fastfile
index 85b3227..3705105 100644
--- a/mobile/fastlane/Fastfile
+++ b/mobile/fastlane/Fastfile
@@ -129,8 +129,9 @@ platform :ios do
     )
 
     node_path = sh("which node").strip
-    File.write("ios/.xcode.env.local", "export NODE_BINARY=#{node_path}\n")
-    UI.message("NODE_BINARY set to #{node_path}")
+    xcode_env_path = File.join(__dir__, "..", "ios", ".xcode.env.local")
+    File.write(xcode_env_path, "export NODE_BINARY=#{node_path}\n")
+    UI.message("NODE_BINARY set to #{node_path} at #{xcode_env_path}")
 
     increment_build_number(
       build_number: ENV["GITHUB_RUN_NUMBER"],