diff --git a/src/benchmark.cpp b/src/benchmark.cpp
index 4735729a..4124899b 100644
--- a/src/benchmark.cpp
+++ b/src/benchmark.cpp
@@ -72,7 +72,6 @@ void benchmark(int argc, char* argv[]) {
 
   Options["Hash"]    = ttSize;
   Options["Threads"] = threads;
-  Options["OwnBook"] = false;
 
   if (valType == "time")
       limits.maxTime = 1000 * atoi(valStr.c_str()); // maxTime is in ms
diff --git a/src/ucioption.cpp b/src/ucioption.cpp
index 75eb2053..fe1a4709 100644
--- a/src/ucioption.cpp
+++ b/src/ucioption.cpp
@@ -76,7 +76,7 @@ OptionsMap::OptionsMap() {
   o["Hash"]                        = UCIOption(32, 4, 8192, on_hash_size);
   o["Clear Hash"]                  = UCIOption(on_clear_hash);
   o["Ponder"]                      = UCIOption(true);
-  o["OwnBook"]                     = UCIOption(true);
+  o["OwnBook"]                     = UCIOption(false);
   o["MultiPV"]                     = UCIOption(1, 1, 500);
   o["Skill Level"]                 = UCIOption(20, 0, 20);
   o["Emergency Move Horizon"]      = UCIOption(40, 0, 50);