diff --git a/dlls/winedos/dosvm.c b/dlls/winedos/dosvm.c
index 9adf72d23a8..71e2791025a 100644
--- a/dlls/winedos/dosvm.c
+++ b/dlls/winedos/dosvm.c
@@ -56,7 +56,9 @@
 
 WINE_DEFAULT_DEBUG_CHANNEL(int);
 WINE_DECLARE_DEBUG_CHANNEL(module);
+#ifdef MZ_SUPPORTED
 WINE_DECLARE_DEBUG_CHANNEL(relay);
+#endif
 
 WORD DOSVM_psp = 0;
 WORD DOSVM_retval = 0;