diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
index 9f67d92a43..4cba6eb2d2 100644
--- a/modules/core/src/system.cpp
+++ b/modules/core/src/system.cpp
@@ -251,7 +251,7 @@ std::wstring GetTempFileNameWinRT(std::wstring prefix)
 #include "omp.h"
 #endif
 
-#if defined __unix__ || defined __APPLE__ || defined __EMSCRIPTEN__ || defined __FreeBSD__ || defined __GLIBC__ || defined __HAIKU__
+#if defined __unix__ || defined __APPLE__ || defined __EMSCRIPTEN__ || defined __FreeBSD__ || defined __OpenBSD__ || defined __GLIBC__ || defined __HAIKU__
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/types.h>