diff --git a/reactos/dll/win32/kernel32/kernel32.def b/reactos/dll/win32/kernel32/kernel32.def
index d62a91a254b..16df9f31af6 100644
--- a/reactos/dll/win32/kernel32/kernel32.def
+++ b/reactos/dll/win32/kernel32/kernel32.def
@@ -519,6 +519,7 @@ GetThreadPriorityBoost@8
 GetThreadSelectorEntry@12
 GetThreadTimes@20
 GetTickCount@0
+GetTickCount64@0
 GetTimeFormatA@24
 GetTimeFormatW@24
 GetTimeZoneInformation@4
diff --git a/reactos/dll/win32/kernel32/misc/time.c b/reactos/dll/win32/kernel32/misc/time.c
index baf7f2ea3d3..0a6877c65b5 100644
--- a/reactos/dll/win32/kernel32/misc/time.c
+++ b/reactos/dll/win32/kernel32/misc/time.c
@@ -398,6 +398,16 @@ GetTickCount(VOID)
 }
 
 
+/*
+ * @implemented
+ */
+ULONGLONG WINAPI
+GetTickCount64(VOID)
+{
+    return (ULONGLONG)SharedUserData->TickCountLowDeprecated * (ULONGLONG)SharedUserData->TickCountMultiplier / 16777216;
+}
+
+
 /*
  * @implemented
  */
diff --git a/reactos/include/psdk/winbase.h b/reactos/include/psdk/winbase.h
index 0e235ee6213..6a8327fbb6e 100644
--- a/reactos/include/psdk/winbase.h
+++ b/reactos/include/psdk/winbase.h
@@ -1592,6 +1592,9 @@ BOOL WINAPI GetThreadPriorityBoost(HANDLE,PBOOL);
 BOOL WINAPI GetThreadSelectorEntry(HANDLE,DWORD,LPLDT_ENTRY);
 BOOL WINAPI GetThreadTimes(HANDLE,LPFILETIME,LPFILETIME,LPFILETIME,LPFILETIME);
 DWORD WINAPI GetTickCount(VOID);
+#if (_WIN32_WINNT >= 0x0600)
+ULONGLONG WINAPI GetTickCount64(VOID);
+#endif
 DWORD WINAPI GetTimeZoneInformation(LPTIME_ZONE_INFORMATION);
 BOOL WINAPI GetTokenInformation(HANDLE,TOKEN_INFORMATION_CLASS,PVOID,DWORD,PDWORD);
 BOOL WINAPI GetUserNameA (LPSTR,PDWORD);