diff --git a/slsDetectorCalibration/dataStructures/HDF5File.h b/slsDetectorCalibration/dataStructures/HDF5File.h
index bf8858bc7..6b3a8c678 100644
--- a/slsDetectorCalibration/dataStructures/HDF5File.h
+++ b/slsDetectorCalibration/dataStructures/HDF5File.h
@@ -20,7 +20,7 @@
 
 //#define MAX_STR_LENGTH	1000
 
-#define RANK	3                       // Dimension of the image dataset, only for validation
+#define RANK	4                       // Dimension of the image dataset, only for validation
 #define DEFAULT_Z_DIMS	10000			// only for validation
 #define DEFAULT_Y_DIMS	1024			// only for validation
 #define DEFAULT_X_DIMS	512				// only for validation