diff --git a/dictsource/vi_rules b/dictsource/vi_rules
index 7b5e653a..0ddd5ec8 100644
--- a/dictsource/vi_rules
+++ b/dictsource/vi_rules
@@ -794,7 +794,7 @@ ỵ	ỵ
         oỉ         OI4
         oĩ         OI5
         oị         OI6
-        ong        O#
+        ong        O#N
         oe         wE        // Adding  oe sound  example: lóe sáng,toét mắt
 		oai        wa:I        // oai sound
         o (@       _^_EN
@@ -825,7 +825,7 @@ ỵ	ỵ
         ò          O2
         òi         OI2
         òa         o@2       //ò (A       w2
-        òng        O#2
+        òng        O#N2
         òe         wE2
         
  
@@ -838,7 +838,7 @@ ỵ	ỵ
         ó          O3
         ói         OI3
         óa         o@3       //ó (A       w3
-        óng        O#3
+        óng        O#N3
         óe         wE3
         óc		   O#3k
  
@@ -851,7 +851,7 @@ ỵ	ỵ
         ỏ          O4
         ỏi         OI4
         ỏa         o@4       //ỏ (A       w4
-        ỏng        O#4
+        ỏng        O#N4
         ỏe         wE4
         
  
@@ -864,7 +864,7 @@ ỵ	ỵ
         õ          O5
         õi         OI5
         õa         o@5       //õ (A       w5
-        õng        O#5
+        õng        O#N5
         õe         wE5
         
  
@@ -877,7 +877,7 @@ ỵ	ỵ
         ọ          O6
         ọi         OI6
         ọa         o@6       //ọ (A       w6
-        ọng        O#6
+        ọng        O#N6
         ọe         wE6
         ọc		   O#6k
  
diff --git a/phsource/ph_vietnam b/phsource/ph_vietnam
index 70da10e7..9d23359d 100644
--- a/phsource/ph_vietnam
+++ b/phsource/ph_vietnam
@@ -610,7 +610,8 @@ phoneme O# // ong
 	ELSE
 	length 200
 	ENDIF
-  FMT(vnasal/&u_n)
+  //FMT(vnasal/&u_n)
+  FMT(vietnam/O_short)
 endphoneme
 
 
diff --git a/phsource/vietnam/O_short b/phsource/vietnam/O_short
new file mode 100644
index 00000000..30a9c337
Binary files /dev/null and b/phsource/vietnam/O_short differ