diff --git a/hw/xwin/InitOutput.c b/hw/xwin/InitOutput.c
index 119012405..07631a9e1 100644
--- a/hw/xwin/InitOutput.c
+++ b/hw/xwin/InitOutput.c
@@ -210,7 +210,7 @@ ddxGiveUp(enum ExitCode error)
 #endif
 
     if (!g_fLogInited) {
-        g_pszLogFile = LogInit(g_pszLogFile, NULL);
+        g_pszLogFile = LogInit(g_pszLogFile, ".old");
         g_fLogInited = TRUE;
     }
     LogClose(error);
@@ -635,7 +635,8 @@ OsVendorInit(void)
          * avoid the second call
          */
         g_fLogInited = TRUE;
-        g_pszLogFile = LogInit(g_pszLogFile, NULL);
+        g_pszLogFile = LogInit(g_pszLogFile, ".old");
+
     }
     LogSetParameter(XLOG_FLUSH, 1);
     LogSetParameter(XLOG_VERBOSITY, g_iLogVerbose);
@@ -865,7 +866,7 @@ ddxUseMsg(void)
 
     /* Log file will not be opened for UseMsg unless we open it now */
     if (!g_fLogInited) {
-        g_pszLogFile = LogInit(g_pszLogFile, NULL);
+        g_pszLogFile = LogInit(g_pszLogFile, ".old");
         g_fLogInited = TRUE;
     }
     LogClose(EXIT_NO_ERROR);
diff --git a/hw/xwin/winerror.c b/hw/xwin/winerror.c
index 1318b0f36..b49f9e59d 100644
--- a/hw/xwin/winerror.c
+++ b/hw/xwin/winerror.c
@@ -75,7 +75,7 @@ OsVendorFatalError(const char *f, va_list args)
 
     if (!g_fLogInited) {
         g_fLogInited = TRUE;
-        g_pszLogFile = LogInit(g_pszLogFile, NULL);
+        g_pszLogFile = LogInit(g_pszLogFile, ".old");
     }
     LogClose(EXIT_ERR_ABORT);