diff --git a/reactos/dll/win32/user32/controls/listbox.c b/reactos/dll/win32/user32/controls/listbox.c
index f556ca1b109..52dd788f69e 100644
--- a/reactos/dll/win32/user32/controls/listbox.c
+++ b/reactos/dll/win32/user32/controls/listbox.c
@@ -37,6 +37,7 @@
 #include <wine/debug.h>
 
 WINE_DEFAULT_DEBUG_CHANNEL(listbox);
+WINE_DECLARE_DEBUG_CHANNEL(combo);
 
 /* Start of hack section -------------------------------- */