diff --git a/src/tests/kits/app/bapplication/testapps/BApplicationTestAppQuitWhenStartedFromAnotherThread.cpp b/src/tests/kits/app/bapplication/testapps/BApplicationTestAppQuitWhenStartedFromAnotherThread.cpp
index eba713defb..4c3f407de6 100644
--- a/src/tests/kits/app/bapplication/testapps/BApplicationTestAppQuitWhenStartedFromAnotherThread.cpp
+++ b/src/tests/kits/app/bapplication/testapps/BApplicationTestAppQuitWhenStartedFromAnotherThread.cpp
@@ -1,5 +1,6 @@
 #include <stdio.h>
 #include <signal.h>
+#include <unistd.h>
 #include <Application.h>
 
 static thread_id gBAppThreadID;