diff --git a/Sources/OpenKey/engine/Vietnamese.cpp b/Sources/OpenKey/engine/Vietnamese.cpp
index 73204be3..65d6c84e 100644
--- a/Sources/OpenKey/engine/Vietnamese.cpp
+++ b/Sources/OpenKey/engine/Vietnamese.cpp
@@ -200,6 +200,7 @@ vector<vector<Uint16>> _consonantD = {
     {KEY_D, KEY_I, KEY_N, KEY_H}, {KEY_D, KEY_I, KEY_H | END_CONSONANT_MASK},
     {KEY_D, KEY_I, KEY_N},
     {KEY_D, KEY_I},
+    {KEY_D, KEY_I, KEY_U},
     {KEY_D, KEY_I, KEY_A},
     {KEY_D, KEY_I, KEY_E},
     {KEY_D, KEY_I, KEY_E, KEY_C},