diff --git a/dlls/ntdll/debugtools.c b/dlls/ntdll/debugtools.c
diff --git a/dlls/winex11.drv/keyboard.c b/dlls/winex11.drv/keyboard.c
index 96a0dc1..1a903fc 100644
--- a/dlls/winex11.drv/keyboard.c
+++ b/dlls/winex11.drv/keyboard.c
@@ -1431,6 +1431,12 @@ void X11DRV_KeyEvent( HWND hwnd, XEvent 
       KEYBOARD_GenerateMsg( VK_CAPITAL, 0x3A, event->type, event_time );
       TRACE("State after : %#.2x\n",key_state_table[vkey]);
       break;
+    case VK_F12:
+      if ((event->type == KeyPress) && getenv("WINEDELAY")) {
+           /* we get this event repeatedly if we hold down the key (keyboard repeat) */
+           __wine_dbg_toggle_block();
+      }
+
     default:
         /* Adjust the NUMLOCK state if it has been changed outside wine */
 	if (!(key_state_table[VK_NUMLOCK] & 0x01) != !(event->state & NumLockMask))
diff --git a/include/wine/debug.h b/include/wine/debug.h
index abde9d9..3d9a82c 100644
--- a/include/wine/debug.h
+++ b/include/wine/debug.h
@@ -157,6 +157,8 @@ extern int __wine_dbg_set_channel_flags(
                                          unsigned char set, unsigned char clear );
 extern void __wine_dbg_set_functions( const struct __wine_debug_functions *new_funcs,
                                       struct __wine_debug_functions *old_funcs, size_t size );
+extern void __wine_dbg_toggle_block();
+
 
 /*
  * Exported definitions and macros
diff --git a/libs/wine/debug.c b/libs/wine/debug.c
index 6f4167f..2773e62 100644
--- a/libs/wine/debug.c
+++ b/libs/wine/debug.c
@@ -47,10 +47,18 @@ static int cmp_name( const void *p1, con
     return strcmp( name, chan->name );
 }
 
+static int block_traces = 0;
+
+/* prevents printing of debug messages temporarily */
+void __wine_dbg_toggle_block() {
+    block_traces = !block_traces;
+    fprintf(stderr, "wine: tracing is now %s\n", block_traces ? "disabled" : "enabled");
+}
+
 /* get the flags to use for a given channel, possibly setting them too in case of lazy init */
 unsigned char __wine_dbg_get_channel_flags( struct __wine_debug_channel *channel )
 {
-    if (nb_debug_options)
+    if (nb_debug_options && !block_traces)
     {
         struct __wine_debug_channel *opt = bsearch( channel->name, debug_options, nb_debug_options,
                                                     sizeof(debug_options[0]), cmp_name );
diff --git a/libs/wine/wine.def b/libs/wine/wine.def
index 462a619..32da0ef 100644
--- a/libs/wine/wine.def
+++ b/libs/wine/wine.def
@@ -5,6 +5,7 @@ EXPORTS
     __wine_dbg_set_channel_flags
     __wine_dbg_set_functions
     __wine_dll_register
+    __wine_dbg_toggle_block
     __wine_main_argc
     __wine_main_argv
     __wine_main_environ
diff --git a/libs/wine/wine.map b/libs/wine/wine.map
index 47e58ce..44e6d7e 100644
--- a/libs/wine/wine.map
+++ b/libs/wine/wine.map
@@ -5,6 +5,7 @@ WINE_1.0
     __wine_dbg_set_channel_flags;
     __wine_dbg_set_functions;
     __wine_dll_register;
+    __wine_dbg_toggle_block;
     __wine_main_argc;
     __wine_main_argv;
     __wine_main_environ;