diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index 41e269e66..7315832ba 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -771,7 +771,7 @@ get_int_operand(codegen_scope *s, struct mrb_insn_data *data, mrb_int *n)
     return TRUE;
 
   case OP_LOADI32:
-    *n = (mrb_int)((uint32_t)data->b<<16)+data->c;
+    *n = (int32_t)((uint32_t)data->b<<16)+data->c;
     return TRUE;
 
   case OP_LOADL: