diff --git a/src/CxbxKrnl/HLEDataBase/Xapi.1.0.5558.inl b/src/CxbxKrnl/HLEDataBase/Xapi.1.0.5558.inl
index 2a34d3751..ec8bd8915 100644
--- a/src/CxbxKrnl/HLEDataBase/Xapi.1.0.5558.inl
+++ b/src/CxbxKrnl/HLEDataBase/Xapi.1.0.5558.inl
@@ -507,6 +507,16 @@ OOVPATable XAPI_1_0_5558[] =
         "EmuSetThreadPriority"
         #endif
     },
+    // XRegisterThreadNotifyRoutine (* unchanged since 3911 *)
+    {
+        (OOVPA*)&XRegisterThreadNotifyRoutine_1_0_3911,
+
+        XTL::EmuXRegisterThreadNotifyRoutine,
+
+        #ifdef _DEBUG_TRACE
+        "EmuXRegisterThreadNotifyRoutine"
+        #endif
+    },
     // RtlCreateHeap
     {
         (OOVPA*)&RtlCreateHeap_1_0_5558,