diff --git a/include/wine/debug.h b/include/wine/debug.h
index fb0d6bb737d..066873a38ad 100644
--- a/include/wine/debug.h
+++ b/include/wine/debug.h
@@ -254,7 +254,7 @@ static inline const char *wine_dbgstr_vt( VARTYPE vt )
     if (vt & ~VT_TYPEMASK)
         return wine_dbg_sprintf( "%s%s", wine_dbgstr_vt(vt&VT_TYPEMASK), variant_flags[vt>>12] );
 
-    if (vt < sizeof(variant_types)/sizeof(*variant_types))
+    if (vt < ARRAY_SIZE(variant_types))
         return variant_types[vt];
 
     if (vt == VT_BSTR_BLOB)