diff --git a/phsource/mbrola/us b/phsource/mbrola/us
index d29b86b1..8e905b52 100644
--- a/phsource/mbrola/us
+++ b/phsource/mbrola/us
@@ -36,6 +36,7 @@
 
 0  0   NULL   0  A
 0  O   NULL   0  O
+0  O2  NULL   0  O
 0  O@  NULL   50  O  r
 0  o@  NULL   50  O  r
 0  A@  NULL   50  A  r