diff --git a/src/simple-mtpfs-fuse.cpp b/src/simple-mtpfs-fuse.cpp
index ffc8b79..772bb42 100644
--- a/src/simple-mtpfs-fuse.cpp
+++ b/src/simple-mtpfs-fuse.cpp
@@ -167,6 +167,11 @@ int wrap_create(const char *path, mode_t mode, fuse_file_info *file_info)
     return SMTPFileSystem::instance()->create(path, mode, file_info);
 }
 
+int wrap_ftruncate(const char *path, off_t offset, struct fuse_file_info *file_info)
+{
+    return SMTPFileSystem::instance()->ftruncate(path, offset, file_info);
+}
+
 // -----------------------------------------------------------------------------
 
 std::unique_ptr<SMTPFileSystem> SMTPFileSystem::s_instance;
@@ -217,6 +222,7 @@ SMTPFileSystem::SMTPFileSystem():
     m_fuse_operations.destroy = nullptr;
     m_fuse_operations.access = nullptr;
     m_fuse_operations.create = wrap_create;
+    m_fuse_operations.ftruncate = wrap_ftruncate;
 }
 
 SMTPFileSystem::~SMTPFileSystem()
@@ -621,6 +627,10 @@ int SMTPFileSystem::fsyncdir(const char *path, int datasync,
 int SMTPFileSystem::ftruncate(const char *path, off_t offset,
     struct fuse_file_info *file_info)
 {
+    const TypeTmpFile *tmp_file = m_tmp_files_pool.getFile(file_info->fh);
+    if (::ftruncate(file_info->fh, offset) != 0)
+        return -errno;
+    const_cast<TypeTmpFile*>(tmp_file)->setModified();
     return 0;
 }
 
diff --git a/src/simple-mtpfs-fuse.h b/src/simple-mtpfs-fuse.h
index b2d076d..975ba20 100644
--- a/src/simple-mtpfs-fuse.h
+++ b/src/simple-mtpfs-fuse.h
@@ -101,7 +101,7 @@ public:
     int readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *file_info);
     int releasedir(const char *path, struct fuse_file_info *file_info);
     int fsyncdir(const char *path, int datasync, struct fuse_file_info *file_info);
-    int truncate(const char *path, off_t offset, struct fuse_file_info *file_info);
+    int ftruncate(const char *path, off_t offset, struct fuse_file_info *file_info);
     void* init(struct fuse_conn_info *conn);
     int create(const char *path, mode_t mode, fuse_file_info *file_info);