diff --git a/dlls/ntdll/ntdll.spec b/dlls/ntdll/ntdll.spec
index c3b6bf0b4fc..8cabf953b46 100644
--- a/dlls/ntdll/ntdll.spec
+++ b/dlls/ntdll/ntdll.spec
@@ -686,7 +686,7 @@
 @ stdcall RtlInitializeCriticalSectionAndSpinCount(ptr long)
 @ stdcall RtlInitializeCriticalSectionEx(ptr long long)
 @ stdcall RtlInitializeGenericTable(ptr ptr ptr ptr ptr)
-# @ stub RtlInitializeGenericTableAvl
+@ stdcall RtlInitializeGenericTableAvl(ptr ptr ptr ptr ptr)
 @ stdcall RtlInitializeHandleTable(long long ptr)
 @ stub RtlInitializeRXact
 # @ stub RtlInitializeRangeList
@@ -696,7 +696,7 @@
 @ stdcall RtlInitializeSid(ptr ptr long)
 # @ stub RtlInitializeStackTraceDataBase
 @ stub RtlInsertElementGenericTable
-# @ stub RtlInsertElementGenericTableAvl
+@ stdcall RtlInsertElementGenericTableAvl(ptr ptr long ptr)
 @ cdecl -arch=x86_64 RtlInstallFunctionTableCallback(long long long ptr ptr wstr)
 @ stdcall RtlInt64ToUnicodeString(int64 long ptr)
 @ stdcall RtlIntegerToChar(long long long ptr)
diff --git a/dlls/ntdll/rtl.c b/dlls/ntdll/rtl.c
index 8eb3e9f017d..74ad35a57cf 100644
--- a/dlls/ntdll/rtl.c
+++ b/dlls/ntdll/rtl.c
@@ -45,6 +45,7 @@
 #include "wine/unicode.h"
 #include "ntdll_misc.h"
 #include "inaddr.h"
+#include "ddk/ntddk.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(ntdll);
 
@@ -1595,3 +1596,20 @@ void WINAPI RtlGetCurrentProcessorNumberEx(PROCESSOR_NUMBER *processor)
     processor->Number = NtGetCurrentProcessorNumber();
     processor->Reserved = 0;
 }
+
+/***********************************************************************
+ *           RtlInitializeGenericTableAvl  (NTDLL.@)
+ */
+void WINAPI RtlInitializeGenericTableAvl(PRTL_AVL_TABLE table, PRTL_AVL_COMPARE_ROUTINE compare,
+                                         PRTL_AVL_ALLOCATE_ROUTINE allocate, PRTL_AVL_FREE_ROUTINE free, void *context)
+{
+    FIXME("%p %p %p %p %p: stub\n", table, compare, allocate, free, context);
+}
+
+/***********************************************************************
+ *           RtlInsertElementGenericTableAvl  (NTDLL.@)
+ */
+void WINAPI RtlInsertElementGenericTableAvl(PRTL_AVL_TABLE table, void *buffer, ULONG size, BOOL *element)
+{
+    FIXME("%p %p %u %p: stub\n", table, buffer, size, element);
+}
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index db152652d8c..1319adaf417 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -1055,12 +1055,12 @@
 @ stdcall RtlInitUnicodeString(ptr wstr) ntdll.RtlInitUnicodeString
 @ stdcall RtlInitializeBitMap(ptr long long) ntdll.RtlInitializeBitMap
 @ stdcall RtlInitializeGenericTable(ptr ptr ptr ptr ptr) ntdll.RtlInitializeGenericTable
-@ stub RtlInitializeGenericTableAvl
+@ stdcall RtlInitializeGenericTableAvl(ptr ptr ptr ptr ptr) ntdll.RtlInitializeGenericTableAvl
 @ stub RtlInitializeRangeList
 @ stdcall RtlInitializeSid(ptr ptr long) ntdll.RtlInitializeSid
 @ stub RtlInitializeUnicodePrefix
 @ stub RtlInsertElementGenericTable
-@ stub RtlInsertElementGenericTableAvl
+@ stdcall RtlInsertElementGenericTableAvl(ptr ptr long ptr) ntdll.RtlInsertElementGenericTableAvl
 @ stub RtlInsertElementGenericTableFull
 @ stub RtlInsertElementGenericTableFullAvl
 @ stub RtlInsertUnicodePrefix
diff --git a/include/ddk/ntddk.h b/include/ddk/ntddk.h
index bccfd39347e..6aae257770d 100644
--- a/include/ddk/ntddk.h
+++ b/include/ddk/ntddk.h
@@ -149,6 +149,43 @@ typedef struct _KWAIT_BLOCK {
     USHORT WaitType;
 } KWAIT_BLOCK, *PKWAIT_BLOCK, *RESTRICTED_POINTER PRKWAIT_BLOCK;
 
+typedef struct _RTL_BALANCED_LINKS {
+    struct _RTL_BALANCED_LINKS *Parent;
+    struct _RTL_BALANCED_LINKS *LeftChild;
+    struct _RTL_BALANCED_LINKS *RightChild;
+    CHAR Balance;
+    UCHAR Reserved[3];
+} RTL_BALANCED_LINKS;
+typedef RTL_BALANCED_LINKS *PRTL_BALANCED_LINKS;
+
+struct _RTL_AVL_TABLE;
+
+typedef enum _RTL_GENERIC_COMPARE_RESULTS {
+    GenericLessThan,
+    GenericGreaterThan,
+    GenericEqual
+} RTL_GENERIC_COMPARE_RESULTS;
+
+typedef RTL_GENERIC_COMPARE_RESULTS (WINAPI *PRTL_AVL_COMPARE_ROUTINE)(struct _RTL_AVL_TABLE *, void *, void *);
+
+typedef void (WINAPI *PRTL_AVL_ALLOCATE_ROUTINE)(struct _RTL_AVL_TABLE *, LONG);
+
+typedef void (WINAPI *PRTL_AVL_FREE_ROUTINE )(struct _RTL_AVL_TABLE *, void *buffer);
+
+typedef struct _RTL_AVL_TABLE {
+    RTL_BALANCED_LINKS BalancedRoot;
+    void *OrderedPointer;
+    ULONG WhichOrderedElement;
+    ULONG NumberGenericTableElements;
+    ULONG DepthOfTree;
+    PRTL_BALANCED_LINKS RestartKey;
+    ULONG DeleteCount;
+    PRTL_AVL_COMPARE_ROUTINE CompareRoutine;
+    PRTL_AVL_ALLOCATE_ROUTINE AllocateRoutine;
+    PRTL_AVL_FREE_ROUTINE FreeRoutine;
+    void *TableContext;
+} RTL_AVL_TABLE, *PRTL_AVL_TABLE;
+
 typedef VOID (WINAPI *PDRIVER_NOTIFICATION_CALLBACK_ROUTINE)(PVOID,PVOID);
 typedef VOID (WINAPI *PDRIVER_REINITIALIZE)(PDRIVER_OBJECT,PVOID,ULONG);
 typedef VOID (WINAPI *PLOAD_IMAGE_NOTIFY_ROUTINE)(PUNICODE_STRING,HANDLE,PIMAGE_INFO);
@@ -160,5 +197,7 @@ NTSTATUS  WINAPI IoQueryDeviceDescription(PINTERFACE_TYPE,PULONG,PCONFIGURATION_
 void      WINAPI IoRegisterDriverReinitialization(PDRIVER_OBJECT,PDRIVER_REINITIALIZE,PVOID);
 NTSTATUS  WINAPI IoRegisterShutdownNotification(PDEVICE_OBJECT);
 NTSTATUS  WINAPI PsSetLoadImageNotifyRoutine(PLOAD_IMAGE_NOTIFY_ROUTINE);
+void      WINAPI RtlInitializeGenericTableAvl(PRTL_AVL_TABLE,PRTL_AVL_COMPARE_ROUTINE,PRTL_AVL_ALLOCATE_ROUTINE, PRTL_AVL_FREE_ROUTINE,void *);
+void      WINAPI RtlInsertElementGenericTableAvl(PRTL_AVL_TABLE,void *,ULONG,BOOL*);
 
 #endif