diff --git a/main.cc b/main.cc
index f1d995c..a0767a8 100644
--- a/main.cc
+++ b/main.cc
@@ -14,9 +14,8 @@ int main(int argc, char * argv[])
     int rc = onig_initialize(encodings, sizeof(encodings) / sizeof(encodings[0]));
     if (rc != ONIG_NORMAL)
     {
-        OnigErrorInfo einfo;
         OnigUChar s[ONIG_MAX_ERROR_MESSAGE_LEN];
-        onig_error_code_to_str(s, rc, &einfo);
+        onig_error_code_to_str(s, rc, nullptr);
         fprintf(stderr, "Error: %s\n", s);
         return 1;
     }