diff --git a/extendedcommands.c b/extendedcommands.c
index 36e696a..95a5f07 100644
--- a/extendedcommands.c
+++ b/extendedcommands.c
@@ -418,7 +418,7 @@ int format_unknown_device(const char *device, const char* path, const char *fs_t
 
     // device may simply be a name, like "system"
     if (device[0] != '/')
-        return erase_partition(device, fs_type);
+        return erase_raw_partition(device);
 
     // if this is SDEXT:, don't worry about it if it does not exist.
     if (0 == strcmp(path, "/sd-ext"))