diff --git a/modules/core/src/parallel.cpp b/modules/core/src/parallel.cpp
index cfff4cea4b..d1454457b7 100644
--- a/modules/core/src/parallel.cpp
+++ b/modules/core/src/parallel.cpp
@@ -54,8 +54,8 @@
 #endif
 
 #if defined __unix__ || defined __APPLE__ || defined __GLIBC__ \
-    || defined __HAIKU__ || defined __EMSCRIPTEN__ || defined __FreeBSD__ \
-    || defined __OpenBSD__
+    || defined __HAIKU__ || defined __EMSCRIPTEN__ \
+    || defined __FreeBSD__ || defined __NetBSD__ || defined __OpenBSD__
     #include <unistd.h>
     #include <stdio.h>
     #include <sys/types.h>