diff --git a/source/duke3d/src/gamestructures.cpp b/source/duke3d/src/gamestructures.cpp
index de2369e1a..24b1b8ef4 100644
--- a/source/duke3d/src/gamestructures.cpp
+++ b/source/duke3d/src/gamestructures.cpp
@@ -427,6 +427,7 @@ void __fastcall VM_SetUserdef(int32_t const labelNum, int32_t const lParm2, int3
             else
                 ud.returnvar[lParm2 - 1] = iSet;
             break;
+        case USERDEFS_USERBYTEVERSION:              ud.userbytever                   = iSet; break;
         case USERDEFS_AUTOSAVE:                     ud.autosave                      = iSet; break;
         default: break;
     }