diff --git a/DDDetectors/src/Mask_o1_v01_geo.cpp b/DDDetectors/src/Mask_o1_v01_geo.cpp
index effe2391979864a9bbd4fad66cff7b2d05c4539b..98b5d376ffc8ce2f6eb989abee5c7f8a3191d625 100644
--- a/DDDetectors/src/Mask_o1_v01_geo.cpp
+++ b/DDDetectors/src/Mask_o1_v01_geo.cpp
@@ -149,7 +149,7 @@ static Ref_t create_detector(Detector& description,
       
       // solid for the tube (including vacuum and wall): a solid cone
       ConeSegment tubeSolid( zHalf, rInnerStart, rOuterStart, rInnerEnd, rOuterEnd , phi1, phi2);
-      
+
       // tube consists of vacuum
       Volume tubeLog0( volName, tubeSolid, material ) ;
       Volume tubeLog1( volName, tubeSolid, material ) ;