diff --git a/include/tapi.h b/include/tapi.h
index 4d7dca08e73..9c5dc498090 100644
--- a/include/tapi.h
+++ b/include/tapi.h
@@ -900,6 +900,9 @@ DWORD WINAPI lineGetTranslateCaps(HLINEAPP,DWORD,LPLINETRANSLATECAPS);
 DWORD WINAPI lineHandoff(HCALL,LPCSTR,DWORD);
 DWORD WINAPI lineHold(HCALL);
 DWORD WINAPI lineInitialize(LPHLINEAPP,HINSTANCE,LINECALLBACK,LPCSTR,LPDWORD);
+LONG  WINAPI lineInitializeExA(LPHLINEAPP,HINSTANCE,LINECALLBACK,LPCSTR,LPDWORD,LPDWORD,LPLINEINITIALIZEEXPARAMS);
+LONG  WINAPI lineInitializeExW(LPHLINEAPP,HINSTANCE,LINECALLBACK,LPCWSTR,LPDWORD,LPDWORD,LPLINEINITIALIZEEXPARAMS);
+#define      lineInitializeEx WINELIB_NAME_AW(lineInitializeEx)
 DWORD WINAPI lineMakeCall(HLINE,LPHCALL,LPCSTR,DWORD,LPLINECALLPARAMS);
 DWORD WINAPI lineMonitorDigits(HCALL,DWORD);
 DWORD WINAPI lineMonitorMedia(HCALL,DWORD);