diff --git a/src/files/cp.js b/src/files/cp.js
index ca62e81eb..de4e0954d 100644
--- a/src/files/cp.js
+++ b/src/files/cp.js
@@ -15,6 +15,6 @@ module.exports = (send) => {
       path: 'files/cp',
       args: sources,
       qs: opts
-    }, callback)
+    }, (error) => callback(error))
   })
 }
diff --git a/src/files/flush.js b/src/files/flush.js
index ea4de8dc6..6a131989b 100644
--- a/src/files/flush.js
+++ b/src/files/flush.js
@@ -12,6 +12,6 @@ module.exports = (send) => {
     return send({
       path: 'files/flush',
       args: args
-    }, callback)
+    }, (error) => callback(error))
   })
 }
diff --git a/src/files/mkdir.js b/src/files/mkdir.js
index 393baecf4..b77fbf6dd 100644
--- a/src/files/mkdir.js
+++ b/src/files/mkdir.js
@@ -13,6 +13,6 @@ module.exports = (send) => {
       path: 'files/mkdir',
       args: args,
       qs: opts
-    }, callback)
+    }, (error) => callback(error))
   })
 }
diff --git a/src/files/mv.js b/src/files/mv.js
index a9ebd640e..234491b28 100644
--- a/src/files/mv.js
+++ b/src/files/mv.js
@@ -15,6 +15,6 @@ module.exports = (send) => {
       path: 'files/mv',
       args: sources,
       qs: opts
-    }, callback)
+    }, (error) => callback(error))
   })
 }
diff --git a/src/files/rm.js b/src/files/rm.js
index 2cfd209b6..404ceed10 100644
--- a/src/files/rm.js
+++ b/src/files/rm.js
@@ -22,6 +22,6 @@ module.exports = (send) => {
       path: 'files/rm',
       args: path,
       qs: opts
-    }, callback)
+    }, (error) => callback(error))
   })
 }