diff --git a/tools/include/libxl_json.h b/tools/include/libxl_json.h
index 260783bfde..3f97267eae 100644
--- a/tools/include/libxl_json.h
+++ b/tools/include/libxl_json.h
@@ -90,7 +90,4 @@ static inline yajl_gen libxl_yajl_gen_alloc(const yajl_alloc_funcs *allocFuncs)
 
 #endif /* !HAVE_YAJL_V2 */
 
-yajl_gen_status libxl_domain_config_gen_json(yajl_gen hand,
-                                             libxl_domain_config *p);
-
 #endif /* LIBXL_JSON_H */