diff --git a/static_core/plugins/ets/compiler/optimizer/ir_builder/ets_inst_builder.cpp b/static_core/plugins/ets/compiler/optimizer/ir_builder/ets_inst_builder.cpp
index 0f519097..c97724b3 100644
--- a/static_core/plugins/ets/compiler/optimizer/ir_builder/ets_inst_builder.cpp
+++ b/static_core/plugins/ets/compiler/optimizer/ir_builder/ets_inst_builder.cpp
@@ -150,8 +150,13 @@ void InstBuilder::BuildStObjByName(const BytecodeInstruction *bcInst, DataType::
             break;
         case DataType::UINT8:
         case DataType::INT8:
+            id = RuntimeInterface::IntrinsicId::INTRINSIC_COMPILER_ETS_ST_OBJ_BY_NAME_I32;
+            type = DataType::INT8;
+            break;
         case DataType::UINT16:
         case DataType::INT16:
+            id = RuntimeInterface::IntrinsicId::INTRINSIC_COMPILER_ETS_ST_OBJ_BY_NAME_I32;
+            type = DataType::INT16;
         case DataType::UINT32:
         case DataType::INT32:
             id = RuntimeInterface::IntrinsicId::INTRINSIC_COMPILER_ETS_ST_OBJ_BY_NAME_I32;
diff --git a/static_core/plugins/ets/tests/lookup_by_name/CMakeLists.txt b/static_core/plugins/ets/tests/lookup_by_name/CMakeLists.txt
index 9ed04f73..d7035204 100644
--- a/static_core/plugins/ets/tests/lookup_by_name/CMakeLists.txt
+++ b/static_core/plugins/ets/tests/lookup_by_name/CMakeLists.txt
@@ -32,6 +32,7 @@ set(LOOKUP_BY_NAME_TEST_LIST
     "field_case_32bit"
     "field_case_64bit"
     "field_case_ref"
+    "peephole_8bit"
 )
 add_custom_target(ets_tests_lookup_by_name)
 add_dependencies(ets_tests ets_tests_lookup_by_name)
diff --git a/static_core/plugins/ets/tests/lookup_by_name/peephole_8bit.pa b/static_core/plugins/ets/tests/lookup_by_name/peephole_8bit.pa
new file mode 100644
index 00000000..3fe02a80
--- /dev/null
+++ b/static_core/plugins/ets/tests/lookup_by_name/peephole_8bit.pa
@@ -0,0 +1,29 @@
+.language eTS
+
+.record std.core.Object
+.record A {
+    i8 bar
+    i8 baz
+}
+
+.union_field i8 bar
+.union_field i8 baz
+
+.function i32 load__noinline__(A a0) {
+    ets.ldobj.name a0, baz
+    return
+}
+
+.function i32 main() {
+    newobj v0, A
+    ldai -1
+    ets.stobj.name v0, bar
+
+    call.short load__noinline__, v0
+    jnez error1
+    ldai 0
+    return
+error1:
+    ldai 1
+    return
+}