diff --git a/lib/diagnostics.h b/lib/diagnostics.h
index a9be37cdc7..ab36e26257 100644
--- a/lib/diagnostics.h
+++ b/lib/diagnostics.h
@@ -150,7 +150,11 @@ extern void set_signal_exit_code(int);
 //
 
 #define BOINCASSERT(expr)   wxASSERT(expr)
+#ifdef _UNICODE
+#define BOINCTRACE          __noop
+#else
 #define BOINCTRACE          wxLogDebug
+#endif
 
 #elif defined(_CONSOLE) && !(defined(__MINGW32__) || defined(__CYGWIN32__))