diff --git a/test/fuzz/fuzzer.cc b/test/fuzz/fuzzer.cc
index 570dfa7e..2ed7683f 100644
--- a/test/fuzz/fuzzer.cc
+++ b/test/fuzz/fuzzer.cc
@@ -1,23 +1,21 @@
-#include <string.h>
+#include <cassert>
 #include "tree_sitter/runtime.h"
 
-void test_log(void *payload, TSLogType type, const char *string) { }
-
-TSLogger logger = {
-  .log = test_log,
-};
-
 extern "C" const TSLanguage *TS_LANG();
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   const char *str = reinterpret_cast<const char *>(data);
 
   TSParser *parser = ts_parser_new();
-  ts_parser_set_language(parser, TS_LANG());
+
+  // This can fail if the language version doesn't match the runtime version
+  bool language_ok = ts_parser_set_language(parser, TS_LANG());
+  assert(language_ok);
+
   ts_parser_halt_on_error(parser, TS_HALT_ON_ERROR);
 
   TSTree *tree = ts_parser_parse_string(parser, NULL, str, size);
-  TSNode root_node = ts_document_root_node(tree);
+  TSNode root_node = ts_tree_root_node(tree);
 
   ts_tree_delete(tree);
   ts_parser_delete(parser);