diff --git a/dlls/kernel32/time.c b/dlls/kernel32/time.c
index b30314ca636..6f953ac2073 100644
--- a/dlls/kernel32/time.c
+++ b/dlls/kernel32/time.c
@@ -443,8 +443,8 @@ BOOL WINAPI SetTimeZoneInformation( const TIME_ZONE_INFORMATION *tzinfo )
  */
 
 BOOL WINAPI SystemTimeToTzSpecificLocalTime(
-    LPTIME_ZONE_INFORMATION lpTimeZoneInformation,
-    LPSYSTEMTIME lpUniversalTime, LPSYSTEMTIME lpLocalTime )
+    const TIME_ZONE_INFORMATION *lpTimeZoneInformation,
+    const SYSTEMTIME *lpUniversalTime, LPSYSTEMTIME lpLocalTime )
 {
     FILETIME ft;
     LONG lBias;
@@ -489,8 +489,8 @@ BOOL WINAPI SystemTimeToTzSpecificLocalTime(
  *  Failure: FALSE.
  */
 BOOL WINAPI TzSpecificLocalTimeToSystemTime(
-    LPTIME_ZONE_INFORMATION lpTimeZoneInformation,
-    LPSYSTEMTIME lpLocalTime, LPSYSTEMTIME lpUniversalTime)
+    const TIME_ZONE_INFORMATION *lpTimeZoneInformation,
+    const SYSTEMTIME *lpLocalTime, LPSYSTEMTIME lpUniversalTime)
 {
     FILETIME ft;
     LONG lBias;
diff --git a/include/winbase.h b/include/winbase.h
index 5a95793bb2a..0794fc6dd4d 100644
--- a/include/winbase.h
+++ b/include/winbase.h
@@ -2098,7 +2098,7 @@ WINBASEAPI DWORD       WINAPI SuspendThread(HANDLE);
 WINBASEAPI void        WINAPI SwitchToFiber(LPVOID);
 WINBASEAPI BOOL        WINAPI SwitchToThread(void);
 WINBASEAPI BOOL        WINAPI SystemTimeToFileTime(const SYSTEMTIME*,LPFILETIME);
-WINBASEAPI BOOL        WINAPI SystemTimeToTzSpecificLocalTime(LPTIME_ZONE_INFORMATION,LPSYSTEMTIME,LPSYSTEMTIME);
+WINBASEAPI BOOL        WINAPI SystemTimeToTzSpecificLocalTime(const TIME_ZONE_INFORMATION*,const SYSTEMTIME*,LPSYSTEMTIME);
 WINBASEAPI BOOL        WINAPI TerminateJobObject(HANDLE,UINT);
 WINBASEAPI BOOL        WINAPI TerminateProcess(HANDLE,DWORD);
 WINBASEAPI BOOL        WINAPI TerminateThread(HANDLE,DWORD);
@@ -2109,7 +2109,7 @@ WINBASEAPI BOOL        WINAPI TlsSetValue(DWORD,LPVOID);
 WINBASEAPI BOOL        WINAPI TransactNamedPipe(HANDLE,LPVOID,DWORD,LPVOID,DWORD,LPDWORD,LPOVERLAPPED);
 WINBASEAPI BOOL        WINAPI TransmitCommChar(HANDLE,CHAR);
 WINBASEAPI BOOL        WINAPI TryEnterCriticalSection(CRITICAL_SECTION *lpCrit);
-WINBASEAPI BOOL        WINAPI TzSpecificLocalTimeToSystemTime(LPTIME_ZONE_INFORMATION,LPSYSTEMTIME,LPSYSTEMTIME);
+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);
 WINBASEAPI BOOL        WINAPI UnlockFileEx(HANDLE,DWORD,DWORD,DWORD,LPOVERLAPPED);