diff --git a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer
index 17820deac..1daa8df8f 100755
Binary files a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer and b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer differ
diff --git a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
index 3b1edcb48..c2741d41a 100644
--- a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
@@ -653,7 +653,7 @@ int configureMAC() {
 	udp->ip_protocol      	= 0x11;
 	// total length is redefined in firmware
 
-	// calcChecksum(udp);
+	calcChecksum(udp);
 
 	//TODO?
 	//cleanFifos();
diff --git a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
index 9c1023fef..82b945e61 100755
--- a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
+++ b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
@@ -270,7 +270,7 @@ void 	selectPrimaryInterface(int val);
 int 	getPrimaryInterface();
 void 	setupHeader(int iRxEntry, enum interfaceType type, uint32_t destip, uint64_t destmac, uint32_t destport, uint64_t sourcemac, uint32_t sourceip, uint32_t sourceport);
 #endif
-#if defined(JUNGFRAUD) || defined(GOTTHARD2D)
+#if defined(JUNGFRAUD) || defined(GOTTHARD2D) || defined(MYTHEN3D)
 void 	calcChecksum(udp_header* udp);
 #endif
 #if defined(CHIPTESTBOARDD) || defined(MOENCHD)
diff --git a/slsSupportLib/include/versionAPI.h b/slsSupportLib/include/versionAPI.h
index 4d0aaa8b6..84195c45a 100644
--- a/slsSupportLib/include/versionAPI.h
+++ b/slsSupportLib/include/versionAPI.h
@@ -8,5 +8,5 @@
 #define APIEIGER 0x191030
 #define APIGOTTHARD 0x191030
 #define APIGOTTHARD2 0x191030
-#define APIMYTHEN3 0x191030
 #define APICTB 0x191030
+#define APIMYTHEN3 0x191031