diff --git a/modules/core/src/system.cpp b/modules/core/src/system.cpp
index cc60cf792c..ffca514f8e 100644
--- a/modules/core/src/system.cpp
+++ b/modules/core/src/system.cpp
@@ -198,7 +198,7 @@ std::wstring GetTempFileNameWinRT(std::wstring prefix)
 
 #include <stdarg.h>
 
-#if defined __linux__ || defined __APPLE__ || defined __EMSCRIPTEN__
+#if defined __linux__ || defined __APPLE__ || defined __EMSCRIPTEN__ || defined __FreeBSD__
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/types.h>