diff --git a/ZAPDTR/ZAPD/Main.cpp b/ZAPDTR/ZAPD/Main.cpp
index 2f1d5be17..d596d0545 100644
--- a/ZAPDTR/ZAPD/Main.cpp
+++ b/ZAPDTR/ZAPD/Main.cpp
@@ -328,7 +328,7 @@ int main(int argc, char* argv[])
 					Directory::ListFiles(Globals::Instance->inputPath.string());
 
 				const int num_threads = std::thread::hardware_concurrency();
-				ctpl::thread_pool pool(num_threads / 2);
+				ctpl::thread_pool pool(num_threads > 1 ? num_threads / 2 : 1);
 
 				bool parseSuccessful;