diff --git a/include/sessions.hpp b/include/sessions.hpp
index 75952e3..c7c92ce 100644
--- a/include/sessions.hpp
+++ b/include/sessions.hpp
@@ -354,9 +354,9 @@
         // TODO(ed) find a secure way to not generate session identifiers if
         // persistence is set to SINGLE_REQUEST
         static constexpr std::array<char, 62> alphanum = {
-            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'b', 'C',
-            'D', 'E', 'F', 'g', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
-            'Q', 'r', 'S', 'T', 'U', 'v', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c',
+            '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C',
+            'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+            'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c',
             'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
             'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};