diff --git a/src/calibre/devices/folder_device/driver.py b/src/calibre/devices/folder_device/driver.py
index 5919d6d2fb..a3d591049d 100644
--- a/src/calibre/devices/folder_device/driver.py
+++ b/src/calibre/devices/folder_device/driver.py
@@ -16,7 +16,8 @@ class FOLDER_DEVICE_FOR_CONFIG(USBMS):
     description    = _('Use an arbitrary folder as a device.')
     author         = 'John Schember/Charles Haley'
     supported_platforms = ['windows', 'osx', 'linux']
-    FORMATS     = ['epub', 'fb2', 'mobi', 'azw', 'lrf', 'tcr', 'pmlz', 'lit', 'rtf', 'rb', 'pdf', 'oeb', 'txt', 'pdb']
+    FORMATS     = ['epub', 'fb2', 'mobi', 'azw', 'lrf', 'tcr', 'pmlz', 'lit',
+                   'rtf', 'rb', 'pdf', 'oeb', 'txt', 'pdb', 'prc']
     VENDOR_ID   = 0xffff
     PRODUCT_ID  = 0xffff
     BCD         = 0xffff