diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index f7d99be521..95f6021535 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -1416,6 +1416,14 @@ Aml *aml_unicode(const char *str)
     return var;
 }
 
+/* ACPI 1.0b: 16.2.5.4 Type 2 Opcodes Encoding: DefRefOf */
+Aml *aml_refof(Aml *arg)
+{
+    Aml *var = aml_opcode(0x71 /* RefOfOp */);
+    aml_append(var, arg);
+    return var;
+}
+
 /* ACPI 1.0b: 16.2.5.4 Type 2 Opcodes Encoding: DefDerefOf */
 Aml *aml_derefof(Aml *arg)
 {
diff --git a/include/hw/acpi/aml-build.h b/include/hw/acpi/aml-build.h
index 70a4b14919..dd432d2450 100644
--- a/include/hw/acpi/aml-build.h
+++ b/include/hw/acpi/aml-build.h
@@ -359,6 +359,7 @@ Aml *aml_create_qword_field(Aml *srcbuf, Aml *index, const char *name);
 Aml *aml_varpackage(uint32_t num_elements);
 Aml *aml_touuid(const char *uuid);
 Aml *aml_unicode(const char *str);
+Aml *aml_refof(Aml *arg);
 Aml *aml_derefof(Aml *arg);
 Aml *aml_sizeof(Aml *arg);
 Aml *aml_concatenate(Aml *source1, Aml *source2, Aml *target);