diff --git a/dynamixel_manager/src/modules/motion_manager.c b/dynamixel_manager/src/modules/motion_manager.c
index e56fd5d9a0b703f1b0799999650bd6a3b225c5be..524cdbfd65b52f5617e42107fe6f06f8bde088a2 100644
--- a/dynamixel_manager/src/modules/motion_manager.c
+++ b/dynamixel_manager/src/modules/motion_manager.c
@@ -334,7 +334,7 @@ unsigned char mmanager_init(TMotionManager *mmanager,TMemory *memory,unsigned sh
     return 0x00;
   mmanager->memory=memory;
   for(i=0;i<DYN_MANAGER_MAX_NUM_DEVICES/2;i++)
-    mmanager->memory->data[ram_base_address+MM_ENABLE_MODULE_OFFSET+i]=0x77;
+    mmanager->memory->data[ram_base_address+RAM_DYN_MODULE_LENGTH+MM_ENABLE_MODULE_OFFSET+i]=0x77;
 
   return 0x01;
 }