diff --git a/Modules/zipimport.c b/Modules/zipimport.c
index 9596026..0a0a778 100644
--- a/Modules/zipimport.c
+++ b/Modules/zipimport.c
@@ -1157,9 +1157,8 @@
 
         strcpy(path + len, zso->suffix);
         if (Py_VerboseFlag > 1)
-            PySys_WriteStderr("# trying %s%c%s\n",
-                              _PyUnicode_AsString(self->archive),
-                              (int)SEP, path);
+            PySys_FormatStderr("# trying %U%c%s\n",
+                              self->archive, (int)SEP, path);
         toc_entry = PyDict_GetItemString(self->files, path);
         if (toc_entry != NULL) {
             time_t mtime = 0;