AVR build fix
diff --git a/tests/fuzztest/fuzztest.c b/tests/fuzztest/fuzztest.c
index 79bc885..d0a54d4 100644
--- a/tests/fuzztest/fuzztest.c
+++ b/tests/fuzztest/fuzztest.c
@@ -514,7 +514,9 @@
     else
     {
         /* Run as a stub for afl-fuzz and similar */
+#ifndef __AVR__
         g_bufsize = 65536;
+#endif
         run_stub();
     }