diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
index b02141f2d5..06e597d6f6 100644
--- a/modules/core/src/system.cpp
+++ b/modules/core/src/system.cpp
@@ -66,7 +66,7 @@ Mutex* __initialization_mutex_initializer = &getInitializationMutex();
 # endif
 #endif
 
-#if defined __ANDROID__ || defined __linux__ || defined __FreeBSD__
+#if defined __ANDROID__ || defined __linux__ || defined __FreeBSD__ || defined __HAIKU__
 #  include <unistd.h>
 #  include <fcntl.h>
 #  include <elf.h>
@@ -202,7 +202,7 @@ std::wstring GetTempFileNameWinRT(std::wstring prefix)
 #include "omp.h"
 #endif
 
-#if defined __linux__ || defined __APPLE__ || defined __EMSCRIPTEN__ || defined __FreeBSD__
+#if defined __linux__ || defined __APPLE__ || defined __EMSCRIPTEN__ || defined __FreeBSD__ || defined __HAIKU__
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/types.h>