diff --git a/dlls/shell32/tests/shlfolder.c b/dlls/shell32/tests/shlfolder.c
index 6460fd93815..bb303f66e48 100644
--- a/dlls/shell32/tests/shlfolder.c
+++ b/dlls/shell32/tests/shlfolder.c
@@ -244,8 +244,8 @@ todo_wine_if(parse_tests[i].todo)
     CoTaskMemFree(pidl);
 
     /* Relative paths are interpreted relative to the desktop. */
-    GetTempPathW(sizeof(buffer), buffer);
-    GetLongPathNameW(buffer, buffer, sizeof(buffer));
+    GetTempPathW(ARRAY_SIZE(buffer), buffer);
+    GetLongPathNameW(buffer, buffer, ARRAY_SIZE(buffer));
     SetCurrentDirectoryW(buffer);
     CreateDirectoryW(testdirW, NULL);