diff --git a/string/public/nsUTF8Utils.h b/string/public/nsUTF8Utils.h
index 9de08796d8e5..a78fe8dd3869 100644
--- a/string/public/nsUTF8Utils.h
+++ b/string/public/nsUTF8Utils.h
@@ -187,8 +187,7 @@ class ConvertUTF8toUTF16
               }
             else
               {
-                if ( ucs4 != 0xFEFF ) // ignore BOM
-                    *out++ = ucs4;
+                *out++ = ucs4;
               }
           }
         mBuffer = out;
diff --git a/xpcom/string/public/nsUTF8Utils.h b/xpcom/string/public/nsUTF8Utils.h
index 9de08796d8e5..a78fe8dd3869 100644
--- a/xpcom/string/public/nsUTF8Utils.h
+++ b/xpcom/string/public/nsUTF8Utils.h
@@ -187,8 +187,7 @@ class ConvertUTF8toUTF16
               }
             else
               {
-                if ( ucs4 != 0xFEFF ) // ignore BOM
-                    *out++ = ucs4;
+                *out++ = ucs4;
               }
           }
         mBuffer = out;