diff --git a/tools/cpucount.cpp b/tools/cpucount.cpp
index 91c2343..af60686 100644
--- a/tools/cpucount.cpp
+++ b/tools/cpucount.cpp
@@ -5,7 +5,7 @@
  *
  * Requires C++11 or better.
  */
-int main()
-{
-    std::cout << std::thread::hardware_concurrency() << std::endl;
+int main() {
+  unsigned int numcpus = std::thread::hardware_concurrency();
+  std::cout << (numcpus > 0 ? numcpus : 1) << std::endl;
 }