diff --git a/include/pocketpy/opcodes.h b/include/pocketpy/opcodes.h
index 7aa20e34..de0fe9df 100644
--- a/include/pocketpy/opcodes.h
+++ b/include/pocketpy/opcodes.h
@@ -13,6 +13,7 @@ OPCODE(LOAD_CONST)
 OPCODE(LOAD_NONE)
 OPCODE(LOAD_TRUE)
 OPCODE(LOAD_FALSE)
+OPCODE(LOAD_INTEGER)
 OPCODE(LOAD_ELLIPSIS)
 OPCODE(LOAD_FUNCTION)
 OPCODE(LOAD_NULL)
diff --git a/src/ceval.cpp b/src/ceval.cpp
index f2613b66..f9a20639 100644
--- a/src/ceval.cpp
+++ b/src/ceval.cpp
@@ -105,6 +105,7 @@ __NEXT_STEP:;
     TARGET(LOAD_NONE)       PUSH(None); DISPATCH();
     TARGET(LOAD_TRUE)       PUSH(True); DISPATCH();
     TARGET(LOAD_FALSE)      PUSH(False); DISPATCH();
+    TARGET(LOAD_INTEGER)    PUSH(VAR((int16_t)byte.arg)); DISPATCH();
     TARGET(LOAD_ELLIPSIS)   PUSH(Ellipsis); DISPATCH();
     TARGET(LOAD_FUNCTION) {
         FuncDecl_ decl = co->func_decls[byte.arg];
@@ -801,8 +802,8 @@ __NEXT_STEP:;
         *p = VAR(CAST(i64, *p) - 1);
     } DISPATCH();
     /*****************************************/
-        static_assert(OP_DEC_GLOBAL == 111);
-        case 112: case 113: case 114: case 115: case 116: case 117: case 118: case 119: case 120: case 121: case 122: case 123: case 124: case 125: case 126: case 127: case 128: case 129: case 130: case 131: case 132: case 133: case 134: case 135: case 136: case 137: case 138: case 139: case 140: case 141: case 142: case 143: case 144: case 145: case 146: case 147: case 148: case 149: case 150: case 151: case 152: case 153: case 154: case 155: case 156: case 157: case 158: case 159: case 160: case 161: case 162: case 163: case 164: case 165: case 166: case 167: case 168: case 169: case 170: case 171: case 172: case 173: case 174: case 175: case 176: case 177: case 178: case 179: case 180: case 181: case 182: case 183: case 184: case 185: case 186: case 187: case 188: case 189: case 190: case 191: case 192: case 193: case 194: case 195: case 196: case 197: case 198: case 199: case 200: case 201: case 202: case 203: case 204: case 205: case 206: case 207: case 208: case 209: case 210: case 211: case 212: case 213: case 214: case 215: case 216: case 217: case 218: case 219: case 220: case 221: case 222: case 223: case 224: case 225: case 226: case 227: case 228: case 229: case 230: case 231: case 232: case 233: case 234: case 235: case 236: case 237: case 238: case 239: case 240: case 241: case 242: case 243: case 244: case 245: case 246: case 247: case 248: case 249: case 250: case 251: case 252: case 253: case 254: case 255: PK_UNREACHABLE() break;
+        static_assert(OP_DEC_GLOBAL == 112);
+        case 113: case 114: case 115: case 116: case 117: case 118: case 119: case 120: case 121: case 122: case 123: case 124: case 125: case 126: case 127: case 128: case 129: case 130: case 131: case 132: case 133: case 134: case 135: case 136: case 137: case 138: case 139: case 140: case 141: case 142: case 143: case 144: case 145: case 146: case 147: case 148: case 149: case 150: case 151: case 152: case 153: case 154: case 155: case 156: case 157: case 158: case 159: case 160: case 161: case 162: case 163: case 164: case 165: case 166: case 167: case 168: case 169: case 170: case 171: case 172: case 173: case 174: case 175: case 176: case 177: case 178: case 179: case 180: case 181: case 182: case 183: case 184: case 185: case 186: case 187: case 188: case 189: case 190: case 191: case 192: case 193: case 194: case 195: case 196: case 197: case 198: case 199: case 200: case 201: case 202: case 203: case 204: case 205: case 206: case 207: case 208: case 209: case 210: case 211: case 212: case 213: case 214: case 215: case 216: case 217: case 218: case 219: case 220: case 221: case 222: case 223: case 224: case 225: case 226: case 227: case 228: case 229: case 230: case 231: case 232: case 233: case 234: case 235: case 236: case 237: case 238: case 239: case 240: case 241: case 242: case 243: case 244: case 245: case 246: case 247: case 248: case 249: case 250: case 251: case 252: case 253: case 254: case 255: PK_UNREACHABLE() break;
     }
 
 }
diff --git a/src/expr.cpp b/src/expr.cpp
index efb8550c..791e3a8c 100644
--- a/src/expr.cpp
+++ b/src/expr.cpp
@@ -246,6 +246,10 @@ namespace pkpy{
         VM* vm = ctx->vm;
         if(std::holds_alternative<i64>(value)){
             i64 _val = std::get<i64>(value);
+            if(is_imm_int(_val)){
+                ctx->emit_(OP_LOAD_INTEGER, (uint16_t)_val, line);
+                return;
+            }
             ctx->emit_(OP_LOAD_CONST, ctx->add_const(VAR(_val)), line);
             return;
         }
@@ -268,7 +272,11 @@ namespace pkpy{
             LiteralExpr* lit = static_cast<LiteralExpr*>(child.get());
             if(std::holds_alternative<i64>(lit->value)){
                 i64 _val = -std::get<i64>(lit->value);
-                ctx->emit_(OP_LOAD_CONST, ctx->add_const(VAR(_val)), line);
+                if(is_imm_int(_val)){
+                    ctx->emit_(OP_LOAD_INTEGER, (uint16_t)_val, line);
+                }else{
+                    ctx->emit_(OP_LOAD_CONST, ctx->add_const(VAR(_val)), line);
+                }
                 return;
             }
             if(std::holds_alternative<f64>(lit->value)){
@@ -587,7 +595,7 @@ namespace pkpy{
             for(auto& item: args) item->emit_(ctx);
             for(auto& item: kwargs){
                 uint16_t index = StrName(item.first.sv()).index;
-                ctx->emit_(OP_LOAD_CONST, ctx->add_const(py_var(ctx->vm, index)), line);
+                ctx->emit_(OP_LOAD_INTEGER, index, line);
                 item.second->emit_(ctx);
             }
             int KWARGC = kwargs.size();