diff --git a/dlls/kernel32/wowthunk.c b/dlls/kernel32/wowthunk.c
index e86c582..b39ac76 100644
--- a/dlls/kernel32/wowthunk.c
+++ b/dlls/kernel32/wowthunk.c
@@ -38,8 +38,11 @@
 #include "wine/debug.h"
 
 WINE_DEFAULT_DEBUG_CHANNEL(thunk);
+
+#ifdef __i386__
 WINE_DECLARE_DEBUG_CHANNEL(relay);
 WINE_DECLARE_DEBUG_CHANNEL(snoop);
+#endif
 
 /*
  * These are the 16-bit side WOW routines.  They reside in wownt16.h