diff --git a/taichi/codegen/spirv/lib_tiny_ir.h b/taichi/codegen/spirv/lib_tiny_ir.h
index e5d9663ff36ab..ca4df0c922009 100644
--- a/taichi/codegen/spirv/lib_tiny_ir.h
+++ b/taichi/codegen/spirv/lib_tiny_ir.h
@@ -60,7 +60,7 @@ class Polymorphic {
     return typeid(*this) == typeid(other) && is_equal(other);
   }
 
-  const bool equals(const Polymorphic *other) const {
+  bool equals(const Polymorphic *other) const {
     return (*this) == (*other);
   }
 
diff --git a/taichi/ir/statements.h b/taichi/ir/statements.h
index a86d91f715c1e..dad5e57aae77a 100644
--- a/taichi/ir/statements.h
+++ b/taichi/ir/statements.h
@@ -734,7 +734,7 @@ class ConstStmt : public Stmt {
   explicit ConstStmt(const LaneAttribute<TypedConstant> &val) : val(val) {
     TI_ASSERT(val.size() == 1);  // TODO: support vectorized case
     ret_type = val[0].dt;
-    for (int i = 0; i < val.size(); i++) {
+    for (std::size_t i = 0; i < val.size(); i++) {
       TI_ASSERT(val[0].dt == val[i].dt);
     }
     TI_STMT_REG_FIELDS;