diff --git a/src/records.rs b/src/records.rs
index 5a7e2cc..27f7eaf 100644
--- a/src/records.rs
+++ b/src/records.rs
@@ -392,7 +392,7 @@ impl Record<Int2> for PROPATTR {
 pub struct PROPVALUE;
 impl Record<ASCII> for PROPVALUE {
     fn tag() -> u16 { RTAG_PROPVALUE }
-    fn expected_size() -> Option<u16> { Some(2) }
+    fn expected_size() -> Option<u16> { None }
 }
 
 pub struct BOX;