diff --git a/getarch.c b/getarch.c
index 4d960356c..1f590390a 100644
--- a/getarch.c
+++ b/getarch.c
@@ -82,7 +82,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifdef OS_WINDOWS
 #include <windows.h>
 #endif
-#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
+#if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(__APPLE__)
 #include <sys/types.h>
 #include <sys/sysctl.h>
 #endif
@@ -1201,7 +1201,7 @@ static int get_num_cores(void) {
 
 #ifdef OS_WINDOWS
   SYSTEM_INFO sysinfo;
-#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(__APPLE__)
   int m[2], count;
   size_t len;
 #endif
@@ -1215,7 +1215,7 @@ static int get_num_cores(void) {
   GetSystemInfo(&sysinfo);
   return sysinfo.dwNumberOfProcessors;
 
-#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__DragonFly__) || defined(__APPLE__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__DragonFly__) || defined(__APPLE__)
   m[0] = CTL_HW;
   m[1] = HW_NCPU;
   len = sizeof(int);