diff --git a/localedata/locales/bn_BD b/localedata/locales/bn_BD
index ac5492390a..7a22cd850b 100644
--- a/localedata/locales/bn_BD
+++ b/localedata/locales/bn_BD
@@ -107,9 +107,10 @@ day         "রবিবার";/
             "শুক্রবার";/
             "শনিবার"
 
-%janu febru march apri may jun jul aug septe octo nove dece
-abmon       "জানু";/
-            "ফেব";/
+% Bangla has no established convention for abbreviating month names,
+% so the abbreviated (%b) and full (%B) forms are the same.
+abmon       "জানুয়ারী";/
+            "ফেব্রুয়ারী";/
             "মার্চ";/
             "এপ্রিল";/
             "মে";/
diff --git a/localedata/locales/bn_IN b/localedata/locales/bn_IN
index 506eecde9e..7a1835375b 100644
--- a/localedata/locales/bn_IN
+++ b/localedata/locales/bn_IN
@@ -89,8 +89,10 @@ day         "রবিবার";"সোমবার";/
 
 %
 % Abbreviated month names (%b)
-abmon       "জানু";/
-            "ফেব";/
+% Bangla has no established convention for abbreviating month names,
+% so the abbreviated (%b) and full (%B) forms are the same.
+abmon       "জানুয়ারী";/
+            "ফেব্রুয়ারী";/
             "মার্চ";"এপ্রিল";/
             "মে";"জুন";/
             "জুলাই";"আগস্ট";/