diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c
index d4d6d78..1d87a53 100644
--- a/arch/sandbox/cpu/os.c
+++ b/arch/sandbox/cpu/os.c
@@ -85,6 +85,8 @@ int os_open(const char *pathname, int os_flags)
 
 	if (os_flags & OS_O_CREAT)
 		flags |= O_CREAT;
+	if (os_flags & OS_O_TRUNC)
+		flags |= O_TRUNC;
 
 	return open(pathname, flags, 0777);
 }
diff --git a/include/os.h b/include/os.h
index 7116f87..9e3a561 100644
--- a/include/os.h
+++ b/include/os.h
@@ -75,6 +75,7 @@ int os_open(const char *pathname, int flags);
 #define OS_O_RDWR	2
 #define OS_O_MASK	3	/* Mask for read/write flags */
 #define OS_O_CREAT	0100
+#define OS_O_TRUNC	01000
 
 /**
  * Access to the OS close() system call