diff --git a/llarp/util/bencode.cpp b/llarp/util/bencode.cpp
index 16e52e00c..1200834db 100644
--- a/llarp/util/bencode.cpp
+++ b/llarp/util/bencode.cpp
@@ -75,7 +75,7 @@ bencode_write_bytestring(llarp_buffer_t* buff, const void* data, size_t sz)
 bool
 bencode_write_uint64(llarp_buffer_t* buff, uint64_t i)
 {
-  if(!buff->writef("i%llu", i))
+  if(!buff->writef("i%lu", i))
   {
     return false;
   }