diff --git a/include/winbase.h b/include/winbase.h
index 7216086c1ca..f35391d8e1d 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -2545,6 +2545,7 @@ WINBASEAPI BOOL        WINAPI TransmitCommChar(HANDLE,CHAR);
 WINBASEAPI BOOLEAN     WINAPI TryAcquireSRWLockExclusive(PSRWLOCK);
 WINBASEAPI BOOLEAN     WINAPI TryAcquireSRWLockShared(PSRWLOCK);
 WINBASEAPI BOOL        WINAPI TryEnterCriticalSection(CRITICAL_SECTION *lpCrit);
+WINBASEAPI BOOL        WINAPI TrySubmitThreadpoolCallback(PTP_SIMPLE_CALLBACK,void*,TP_CALLBACK_ENVIRON*);
 WINBASEAPI BOOL        WINAPI TzSpecificLocalTimeToSystemTime(const TIME_ZONE_INFORMATION*,const SYSTEMTIME*,LPSYSTEMTIME);
 WINBASEAPI LONG        WINAPI UnhandledExceptionFilter(PEXCEPTION_POINTERS);
 WINBASEAPI BOOL        WINAPI UnlockFile(HANDLE,DWORD,DWORD,DWORD,DWORD);