diff --git a/phsource/ph_vietnam b/phsource/ph_vietnam
index f4b8df65..f61eb703 100644
--- a/phsource/ph_vietnam
+++ b/phsource/ph_vietnam
@@ -785,7 +785,7 @@ phoneme p
   Vowelin  f1=0  f2=1000 -50 -100  f3=-200 80 amp=11
   Vowelout f1=0  f2=1000 -500 -350  f3=-300 80 rms=22
 
-    WAV(ustop/p_unasp_,10)
+    WAV(ustop/p)
   
 endphoneme