diff --git a/src/capi_types.rs b/src/capi_types.rs
index 3b0bdd5..9bc3489 100644
--- a/src/capi_types.rs
+++ b/src/capi_types.rs
@@ -1,4 +1,6 @@
+use failure::*;
 use std::os::raw::{c_char, c_void};
+use std::sync::{Mutex, Arc, mpsc::Sender };
 
 pub(crate) struct CallbackPointers {
     pub callback: extern "C" fn(*mut c_void),
@@ -12,3 +14,33 @@ unsafe impl std::marker::Send for DataPointer {}
 
 #[repr(C)]
 pub struct ProxmoxBackupHandle;
+
+pub(crate) enum BackupMessage {
+    End,
+    Abort,
+    AddConfig {
+        name: String,
+        data: DataPointer,
+        size: u64,
+        result_channel: Arc<Mutex<Sender<Result<(), Error>>>>,
+    },
+    RegisterImage {
+        device_name: String,
+        size: u64,
+        result_channel: Arc<Mutex<Sender<Result<u8, Error>>>>,
+    },
+    CloseImage {
+        dev_id: u8,
+        callback_info: CallbackPointers,
+    },
+    WriteData {
+        dev_id: u8,
+        data: DataPointer,
+        offset: u64,
+        size: u64,
+        callback_info: CallbackPointers,
+    },
+    Finish {
+        callback_info: CallbackPointers,
+    },
+}
diff --git a/src/worker_task.rs b/src/worker_task.rs
index cb2345f..5ac5c04 100644
--- a/src/worker_task.rs
+++ b/src/worker_task.rs
@@ -43,36 +43,6 @@ pub(crate) struct BackupTaskStats {
     written_bytes: u64,
 }
 
-pub(crate) enum BackupMessage {
-    End,
-    Abort,
-    AddConfig {
-        name: String,
-        data: DataPointer,
-        size: u64,
-        result_channel: Arc<Mutex<Sender<Result<(), Error>>>>,
-    },
-    RegisterImage {
-        device_name: String,
-        size: u64,
-        result_channel: Arc<Mutex<Sender<Result<u8, Error>>>>,
-    },
-    CloseImage {
-        dev_id: u8,
-        callback_info: CallbackPointers,
-    },
-    WriteData {
-        dev_id: u8,
-        data: DataPointer,
-        offset: u64,
-        size: u64,
-        callback_info: CallbackPointers,
-    },
-    Finish {
-        callback_info: CallbackPointers,
-    },
-}
-
 struct ImageUploadInfo {
     wid: u64,
     device_name: String,