diff --git a/crates/oxide_emit/src/expr/identifier.rs b/crates/oxide_emit/src/expr/identifier.rs
index 3946e2a..f1d2d61 100644
--- a/crates/oxide_emit/src/expr/identifier.rs
+++ b/crates/oxide_emit/src/expr/identifier.rs
@@ -15,7 +15,7 @@ impl Emitter {
             if up.name == name {
                 let r = ctx.alloc_reg();
                 let idx = uv_idx as u8;
-                ctx.inst(Inst::new(OpCode::LOAD_UPVALUE, Operand::Reg(r), Operand::Reg(idx as u32), Operand::None));
+                ctx.inst(Inst::new(OpCode::LOAD_UPVALUE, Operand::Reg(r), Operand::Imm(idx as u16), Operand::None));
                 return Ok(r);
             }
         }