diff --git a/src/utilities.h b/src/utilities.h
index 6ab7f5c..ee54f94 100644
--- a/src/utilities.h
+++ b/src/utilities.h
@@ -44,6 +44,8 @@
 # define OS_MACOSX
 #elif defined(__FreeBSD__)
 # define OS_FREEBSD
+#elif defined(__NetBSD__)
+# define OS_NETBSD
 #elif defined(__OpenBSD__)
 # define OS_OPENBSD
 #else