diff --git a/components/mdns/test_afl_fuzz_host/test.c b/components/mdns/test_afl_fuzz_host/test.c
index 776a089cd..58b304e92 100644
--- a/components/mdns/test_afl_fuzz_host/test.c
+++ b/components/mdns/test_afl_fuzz_host/test.c
@@ -205,6 +205,7 @@ int main(int argc, char** argv)
         // Note: parameter1 is a file (mangled packet) which caused the crash
         file = fopen(argv[1], "r");
         assert(file >= 0 );
+        len = fread(buf, 1, 1460, file);
         fclose(file);
     }