diff --git a/hw/dmx/dmxinit.c b/hw/dmx/dmxinit.c
index 09e3d74ea..5804353fb 100644
--- a/hw/dmx/dmxinit.c
+++ b/hw/dmx/dmxinit.c
@@ -905,7 +905,7 @@ OsVendorInit(void)
  * two routines mentioned here, as well as by others) to use the
  * referenced routine instead of \a vfprintf().) */
 void
-OsVendorFatalError(void)
+OsVendorFatalError(const char *f, va_list args)
 {
 }
 
diff --git a/hw/dmx/dmxlog.c b/hw/dmx/dmxlog.c
index b56bb93ed..33aee590a 100644
--- a/hw/dmx/dmxlog.c
+++ b/hw/dmx/dmxlog.c
@@ -110,9 +110,6 @@ VFatalError(const char *format, va_list args)
 {
     VErrorF(format, args);
     ErrorF("\n");
-#ifdef DDXOSFATALERROR
-    OsVendorFatalError();
-#endif
     AbortServer();
  /*NOTREACHED*/}
 #endif
diff --git a/hw/kdrive/src/kdrive.c b/hw/kdrive/src/kdrive.c
index f65ab96bc..ecdae1921 100644
--- a/hw/kdrive/src/kdrive.c
+++ b/hw/kdrive/src/kdrive.c
@@ -1104,7 +1104,7 @@ KdInitOutput(ScreenInfo * pScreenInfo, int argc, char **argv)
 }
 
 void
-OsVendorFatalError(void)
+OsVendorFatalError(const char *f, va_list args)
 {
 }
 
diff --git a/hw/vfb/InitOutput.c b/hw/vfb/InitOutput.c
index 2d679a559..e2cd96cdc 100644
--- a/hw/vfb/InitOutput.c
+++ b/hw/vfb/InitOutput.c
@@ -219,7 +219,7 @@ OsVendorInit(void)
 }
 
 void
-OsVendorFatalError(void)
+OsVendorFatalError(const char *f, va_list args)
 {
 }
 
diff --git a/hw/xfree86/common/xf86Init.c b/hw/xfree86/common/xf86Init.c
index 0974893d3..2a7d0a37e 100644
--- a/hw/xfree86/common/xf86Init.c
+++ b/hw/xfree86/common/xf86Init.c
@@ -1053,7 +1053,7 @@ AbortDDX(enum ExitCode error)
 }
 
 void
-OsVendorFatalError(void)
+OsVendorFatalError(const char *f, va_list args)
 {
 #ifdef VENDORSUPPORT
     ErrorF("\nPlease refer to your Operating System Vendor support pages\n"
diff --git a/hw/xnest/Init.c b/hw/xnest/Init.c
index 0909826d9..330b8ca17 100644
--- a/hw/xnest/Init.c
+++ b/hw/xnest/Init.c
@@ -142,7 +142,7 @@ OsVendorInit(void)
 }
 
 void
-OsVendorFatalError(void)
+OsVendorFatalError(const char *f, va_list args)
 {
     return;
 }
diff --git a/hw/xquartz/darwin.c b/hw/xquartz/darwin.c
index 29036fc77..3dd41cba8 100644
--- a/hw/xquartz/darwin.c
+++ b/hw/xquartz/darwin.c
@@ -634,7 +634,7 @@ InitOutput(ScreenInfo * pScreenInfo, int argc, char **argv)
  * OsVendorFatalError
  */
 void
-OsVendorFatalError(void)
+OsVendorFatalError(const char *f, va_list args)
 {
     ErrorF("   OsVendorFatalError\n");
 }
diff --git a/hw/xwin/winerror.c b/hw/xwin/winerror.c
index 4049e9735..a25307cb6 100644
--- a/hw/xwin/winerror.c
+++ b/hw/xwin/winerror.c
@@ -70,7 +70,7 @@ OsVendorVErrorF(const char *pszFormat, va_list va_args)
  * Attempt to do last-ditch, safe, important cleanup here.
  */
 void
-OsVendorFatalError(void)
+OsVendorFatalError(const char *f, va_list args)
 {
     /* Don't give duplicate warning if UseMsg was called */
     if (g_fSilentFatalError)
diff --git a/include/os.h b/include/os.h
index dd06a8578..166c60cd8 100644
--- a/include/os.h
+++ b/include/os.h
@@ -321,7 +321,7 @@ extern _X_EXPORT void
 OsCleanup(Bool);
 
 extern _X_EXPORT void
-OsVendorFatalError(void);
+OsVendorFatalError(const char *f, va_list args);
 
 extern _X_EXPORT void
 OsVendorInit(void);
diff --git a/os/log.c b/os/log.c
index 1b1b28519..9a719696c 100644
--- a/os/log.c
+++ b/os/log.c
@@ -593,6 +593,7 @@ void
 FatalError(const char *f, ...)
 {
     va_list args;
+    va_list args2;
     static Bool beenhere = FALSE;
 
     if (beenhere)
@@ -600,22 +601,25 @@ FatalError(const char *f, ...)
     else
         ErrorF("\nFatal server error:\n");
 
-    va_start(args, f);
+    /* Make a copy for OsVendorFatalError */
+    va_copy(args2, args);
+
 #ifdef __APPLE__
     {
-        va_list args2;
+        va_list apple_args;
 
-        va_copy(args2, args);
-        (void) vsnprintf(__crashreporter_info_buff__,
-                         sizeof(__crashreporter_info_buff__), f, args2);
-        va_end(args2);
+        va_copy(apple_args, args);
+        (void)vsnprintf(__crashreporter_info_buff__,
+                        sizeof(__crashreporter_info_buff__), f, apple_args);
+        va_end(apple_args);
     }
 #endif
     VErrorF(f, args);
     va_end(args);
     ErrorF("\n");
     if (!beenhere)
-        OsVendorFatalError();
+        OsVendorFatalError(f, args2);
+    va_end(args2);
     if (!beenhere) {
         beenhere = TRUE;
         AbortServer();
diff --git a/test/ddxstubs.c b/test/ddxstubs.c
index a214b9637..3647dc556 100644
--- a/test/ddxstubs.c
+++ b/test/ddxstubs.c
@@ -50,7 +50,7 @@ OsVendorInit(void)
 }
 
 void
-OsVendorFatalError(void)
+OsVendorFatalError(const char *f, va_list args)
 {
 }