diff --git a/DDCore/src/segmentations/CartesianGridXYStaggered.cpp b/DDCore/src/segmentations/CartesianGridXYStaggered.cpp
index 9017c4388..871958ffe 100644
--- a/DDCore/src/segmentations/CartesianGridXYStaggered.cpp
+++ b/DDCore/src/segmentations/CartesianGridXYStaggered.cpp
@@ -89,7 +89,7 @@ Vector3D CartesianGridXYStaggered::position(const CellID& cID) const {
 }
 
 
-std::vector<double> cellDimensions(const CellID& cellID) const {
+std::vector<double> CartesianGridXYStaggered::cellDimensions(const CellID& cellID) const {
   return {_gridSizeX, _gridSizeY};
 }