diff --git a/fs/inode/fs_files.c b/fs/inode/fs_files.c
index 570f5f5f6a..ad6e2e893b 100644
--- a/fs/inode/fs_files.c
+++ b/fs/inode/fs_files.c
@@ -35,6 +35,7 @@
 #include <nuttx/kmalloc.h>
 #include <nuttx/cancelpt.h>
 #include <nuttx/mutex.h>
+#include <nuttx/sched.h>
 
 #include "inode/inode.h"
 
@@ -97,6 +98,39 @@ static int files_extend(FAR struct filelist *list, size_t row)
   return 0;
 }
 
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+
+static void task_fssync(FAR struct tcb_s *tcb, FAR void *arg)
+{
+  FAR struct filelist *list;
+  int i;
+  int j;
+
+  list = &tcb->group->tg_filelist;
+  if (nxmutex_lock(&list->fl_lock) < 0)
+    {
+      return;
+    }
+
+  for (i = 0; i < list->fl_rows; i++)
+    {
+      for (j = 0; j < CONFIG_NFILE_DESCRIPTORS_PER_BLOCK; j++)
+        {
+          FAR struct file *filep;
+
+          filep = &list->fl_files[i][j];
+          if (filep != NULL && filep->f_inode != NULL)
+            {
+              file_fsync(filep);
+            }
+        }
+    }
+
+  nxmutex_unlock(&list->fl_lock);
+}
+
+#endif /* !CONFIG_DISABLE_MOUNTPOINT */
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -603,3 +637,21 @@ int close(int fd)
   leave_cancellation_point();
   return ret;
 }
+
+#ifndef CONFIG_DISABLE_MOUNTPOINT
+
+/****************************************************************************
+ * Name: sync
+ *
+ * Description:
+ *   sync() causes all pending modifications to filesystem metadata and
+ *   cached file data to be written to the underlying filesystems.
+ *
+ ****************************************************************************/
+
+void sync(void)
+{
+  nxsched_foreach(task_fssync, NULL);
+}
+
+#endif /* !CONFIG_DISABLE_MOUNTPOINT */
diff --git a/include/sys/syscall_lookup.h b/include/sys/syscall_lookup.h
index 4c44ea2919..a159cad3ff 100644
--- a/include/sys/syscall_lookup.h
+++ b/include/sys/syscall_lookup.h
@@ -271,6 +271,7 @@ SYSCALL_LOOKUP(munmap,                     2)
 
 #ifndef CONFIG_DISABLE_MOUNTPOINT
   SYSCALL_LOOKUP(mount,                    5)
+  SYSCALL_LOOKUP(sync,                     0)
   SYSCALL_LOOKUP(fsync,                    1)
   SYSCALL_LOOKUP(ftruncate,                2)
   SYSCALL_LOOKUP(mkdir,                    2)
diff --git a/include/unistd.h b/include/unistd.h
index 0ee4275de9..4c49eaabd2 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -438,6 +438,8 @@ int     setregid(gid_t rgid, gid_t egid);
 
 int     getentropy(FAR void *buffer, size_t length);
 
+void    sync(void);
+
 #undef EXTERN
 #if defined(__cplusplus)
 }
diff --git a/syscall/syscall.csv b/syscall/syscall.csv
index dd3a221d43..ac2706ac36 100644
--- a/syscall/syscall.csv
+++ b/syscall/syscall.csv
@@ -166,6 +166,7 @@
 "stat","sys/stat.h","","int","FAR const char *","FAR struct stat *"
 "statfs","sys/statfs.h","","int","FAR const char *","FAR struct statfs *"
 "symlink","unistd.h","defined(CONFIG_PSEUDOFS_SOFTLINKS)","int","FAR const char *","FAR const char *"
+"sync","unistd.h","!defined(CONFIG_DISABLE_MOUNTPOINT)","void"
 "sysinfo","sys/sysinfo.h","","int","FAR struct sysinfo *"
 "task_create","sched.h","!defined(CONFIG_BUILD_KERNEL)", "int","FAR const char *","int","int","main_t","FAR char * const []|FAR char * const *"
 "task_delete","sched.h","!defined(CONFIG_BUILD_KERNEL)","int","pid_t"