diff --git a/phsource/ph_vietnam b/phsource/ph_vietnam
index 3204d817..49cfda3f 100644
--- a/phsource/ph_vietnam
+++ b/phsource/ph_vietnam
@@ -775,7 +775,7 @@ endphoneme
 
 phoneme w
   liquid
-  lengthmod 7
+  length 20
   starttype #u
   
   IF nextPh(isVowel) THEN