diff --git a/volume_manager/EmulatedVolume.h b/volume_manager/EmulatedVolume.h
index ac40b6f..66421cc 100644
--- a/volume_manager/EmulatedVolume.h
+++ b/volume_manager/EmulatedVolume.h
@@ -55,6 +55,8 @@
     unsigned long mFlags;
     std::string mFsOptions;
 
+    bool detectMountable() override;
+
     DISALLOW_COPY_AND_ASSIGN(EmulatedVolume);
 };