diff --git a/TestsLinux/PlatformGatingTests.swift b/TestsLinux/PlatformGatingTests.swift
index a3e4309308..84031b51c8 100644
--- a/TestsLinux/PlatformGatingTests.swift
+++ b/TestsLinux/PlatformGatingTests.swift
@@ -85,7 +85,7 @@ struct PlatformGatingTests {
         #endif
     }
 
-    @Test(arguments: [ProviderSourceMode.auto, .cli])
+    @Test(.serialized, arguments: [ProviderSourceMode.auto, .cli])
     func `Claude CLI runtime skips logged out interactive fallback`(sourceMode: ProviderSourceMode) async throws {
         #if os(Linux)
         let invocationLog = FileManager.default.temporaryDirectory