diff --git a/src/Disks/IVolume.cpp b/src/Disks/IVolume.cpp
index 6dccef1136a..9f51f7446dc 100644
--- a/src/Disks/IVolume.cpp
+++ b/src/Disks/IVolume.cpp
@@ -12,7 +12,6 @@ namespace ErrorCodes
     extern const int EXCESSIVE_ELEMENT_IN_CONFIG;
     extern const int INCONSISTENT_RESERVATIONS;
     extern const int NO_RESERVATIONS_PROVIDED;
-    extern const int UNKNOWN_VOLUME_TYPE;
 }
 
 String volumeTypeToString(VolumeType t)