diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 2bebf23db2754691b6a905e373f0816450a7741e..0d4b3247b7af5f96abbcf645d956e2017fe9185f 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -687,6 +687,14 @@ Aml *aml_else(void)
     return var;
 }
 
+/* ACPI 1.0b: 16.2.5.3 Type 1 Opcodes Encoding: DefWhile */
+Aml *aml_while(Aml *predicate)
+{
+    Aml *var = aml_bundle(0xA2 /* WhileOp */, AML_PACKAGE);
+    aml_append(var, predicate);
+    return var;
+}
+
 /* ACPI 1.0b: 16.2.5.2 Named Objects Encoding: DefMethod */
 Aml *aml_method(const char *name, int arg_count)
 {