1 files changed, 1 insertions, 1 deletions

diff --git a/arabluatex.lua b/arabluatex.lua
index 523eece..088d241 100644
--- a/arabluatex.lua
+++ b/arabluatex.lua
@@ -670,7 +670,7 @@ function uc(str)
                         body = string.sub(body, 2, -2)
                         return string.format("%s", body)
    end)
-   str = string.gsub(str, "(%s[%(%<%[]?)(i?b[n%.])", "%1{%2}")
+   str = string.gsub(str, "(%s[%(%<%[]?)([i%']?b[n%.])", "%1{%2}")
    for i = 1,#lcuc do
       str = string.gsub(str, "^([%S]-%-[`']?)"..lcuc[i].a, "{%1"..lcuc[i].b.."}")
    end