diff --git a/slsDetectorServers/gotthard2DetectorServer/RegisterDefs.h b/slsDetectorServers/gotthard2DetectorServer/RegisterDefs.h
index 1d1274e5f..c312ff892 100644
--- a/slsDetectorServers/gotthard2DetectorServer/RegisterDefs.h
+++ b/slsDetectorServers/gotthard2DetectorServer/RegisterDefs.h
@@ -122,6 +122,12 @@
 /** DTA Offset Register */
 #define DTA_OFFSET_REG                      (0x0A * REG_OFFSET + BASE_CONTROL)
 
+
+#define MOD_ID_REG                          (0x0D * REG_OFFSET + BASE_CONTROL)
+
+#define MOD_ID_OFST                         (0)
+#define MOD_ID_MSK                          (0x0000FFFF << MOD_ID_OFST)
+
 /* ASIC registers --------------------------------------------------*/
 
 /* ASIC Config register */