diff --git a/src/nnue/evaluate_nnue.cpp b/src/nnue/evaluate_nnue.cpp
index 799a551a..64501675 100644
--- a/src/nnue/evaluate_nnue.cpp
+++ b/src/nnue/evaluate_nnue.cpp
@@ -1,4 +1,4 @@
-// Code for calculating NNUE evaluation function
+// Code for calculating NNUE evaluation function
 
 #include <fstream>
 #include <iostream>
@@ -42,7 +42,7 @@ namespace Eval::NNUE {
   AlignedPtr<Network> network;
 
   // Evaluation function file name
-  std::string fileName = "nn.bin";
+  std::string fileName;
 
   // Get a string that represents the structure of the evaluation function
   std::string GetArchitectureString() {
diff --git a/src/ucioption.cpp b/src/ucioption.cpp
index e818ef13..aa07dc73 100644
--- a/src/ucioption.cpp
+++ b/src/ucioption.cpp
@@ -94,7 +94,7 @@ void init(OptionsMap& o) {
   o["Syzygy50MoveRule"]      << Option(true);
   o["SyzygyProbeLimit"]      << Option(7, 0, 7);
   o["Use NNUE"]              << Option(false, on_use_nnue);
-  o["EvalFile"]              << Option("nn-c157e0a5755b.bin", on_eval_file);
+  o["EvalFile"]              << Option("nn-c157e0a5755b.nnue", on_eval_file);
 }