diff --git a/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
index 0920aa394..e593b5bae 100644
--- a/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
@@ -288,11 +288,11 @@ u_int32_t getDetectorNumber() {
 }
 
 int getModuleId(int *ret, char *mess) {
-    return ((bus_r(MOD_ID_REG) & ~MOD_ID_MSK) >> MOD_ID_OFST);
+    return ((bus_r(MOD_ID_REG) & MOD_ID_MSK) >> MOD_ID_OFST);
 }
 
 void setModuleId(int modid) {
-    LOG(logINFOBLUE, ("Setting module id in fpga: %d\n", modid))
+    LOG(logINFOBLUE, ("Setting module id in fpga: 0x%x\n", modid))
     bus_w(MOD_ID_REG, bus_r(MOD_ID_REG) & ~MOD_ID_MSK);
     bus_w(MOD_ID_REG, bus_r(MOD_ID_REG) | ((modid << MOD_ID_OFST) & MOD_ID_MSK));
 }
diff --git a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
index 71b62a216..71e4a9315 100644
--- a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
@@ -283,11 +283,11 @@ u_int32_t getDetectorNumber() {
 
 
 int getModuleId(int *ret, char *mess) {
-    return ((bus_r(MOD_ID_REG) & ~MOD_ID_MSK) >> MOD_ID_OFST);
+    return ((bus_r(MOD_ID_REG) & MOD_ID_MSK) >> MOD_ID_OFST);
 }
 
 void setModuleId(int modid) {
-    LOG(logINFOBLUE, ("Setting module id in fpga: %d\n", modid))
+    LOG(logINFOBLUE, ("Setting module id in fpga: 0x%x\n", modid))
     bus_w(MOD_ID_REG, bus_r(MOD_ID_REG) & ~MOD_ID_MSK);
     bus_w(MOD_ID_REG,
           bus_r(MOD_ID_REG) | ((modid << MOD_ID_OFST) & MOD_ID_MSK));