diff --git a/src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc b/src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
index 3a4cb2423..593a00e9c 100644
--- a/src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
+++ b/src/xenia/kernel/xboxkrnl/xboxkrnl_threading.cc
@@ -899,6 +899,10 @@ dword_result_t NtSetTimerEx_entry(dword_t timer_handle, lpqword_t due_time_ptr,
   assert_true(mode == 1);
   assert_true(!unk_zero);
 
+  if (unk_zero) {
+    XELOGI("NtSetTimerEx: unk_zero is set!");
+  }
+
   uint64_t due_time = *due_time_ptr;
 
   X_STATUS result = X_STATUS_SUCCESS;
diff --git a/src/xenia/kernel/xtimer.cc b/src/xenia/kernel/xtimer.cc
index c1b806b1e..22732f074 100644
--- a/src/xenia/kernel/xtimer.cc
+++ b/src/xenia/kernel/xtimer.cc
@@ -40,10 +40,6 @@ X_STATUS XTimer::SetTimer(int64_t due_time, uint32_t period_ms,
                           uint32_t routine, uint32_t routine_arg, bool resume) {
   using xe::chrono::WinSystemClock;
   using xe::chrono::XSystemClock;
-  // Caller is checking for STATUS_TIMER_RESUME_IGNORED.
-  if (resume) {
-    return X_STATUS_TIMER_RESUME_IGNORED;
-  }
 
   std::lock_guard<std::mutex> lock(timer_lock_);
 
@@ -92,6 +88,11 @@ X_STATUS XTimer::SetTimer(int64_t due_time, uint32_t period_ms,
         due_tp, std::chrono::milliseconds(period_ms), std::move(callback));
   }
 
+  if (resume) {
+    XThread::SetLastError(X_ERROR_NOT_SUPPORTED);
+    return X_STATUS_TIMER_RESUME_IGNORED;
+  }
+
   return result ? X_STATUS_SUCCESS : X_STATUS_UNSUCCESSFUL;
 }