diff --git a/src/acpi/aml/namedobj.rs b/src/acpi/aml/namedobj.rs
index f0067d4..8422b41 100644
--- a/src/acpi/aml/namedobj.rs
+++ b/src/acpi/aml/namedobj.rs
@@ -744,7 +744,7 @@ fn parse_reserved_field(data: &[u8], _ctx: &mut AmlExecutionContext) -> Result<A
 }
 
 fn parse_access_field(data: &[u8], _ctx: &mut AmlExecutionContext) -> Result<AmlParseTypeGeneric<AccessField>, AmlError> {
-    if data.len() < 2 {
+    if data.len() < 3 {
         return Err(AmlError::AmlParseError("AccessField - data truncated"))
     }