diff --git a/src/core/detector/Detector.hpp b/src/core/detector/Detector.hpp
index 3b2139143119c575d84ec5062b3a1be7120383b1..1dca591145203e501846e1f9a2747fcb59adad9a 100644
--- a/src/core/detector/Detector.hpp
+++ b/src/core/detector/Detector.hpp
@@ -237,7 +237,7 @@ namespace corryvreckan {
          * @param row Row (y-) index of the pixel to calculate the spatial resolution from
          * @return Intrinsic spatial resolution in global X and Y
          */
-        virtual TMatrixD getSpatialResolutionMatrixGlobal(double, double) const = 0;
+        virtual TMatrixD getSpatialResolutionMatrixGlobal(double column = 0, double row = 0) const = 0;
 
         /**
          * @brief Get number of pixels in x and y