diff --git a/DirectVolume.h b/DirectVolume.h
index beda7c3..149ec56 100644
--- a/DirectVolume.h
+++ b/DirectVolume.h
@@ -72,6 +72,7 @@
     void handlePartitionChanged(const char *devpath, NetlinkEvent *evt);
 
     int doMountVfat(const char *deviceNode, const char *mountPoint);
+    void doUnmount(int major, int minor);
 
 };