diff --git a/build_info.json b/build_info.json
index cd3ea06..4400c85 100644
--- a/build_info.json
+++ b/build_info.json
@@ -1,8 +1,8 @@
 {
     "build_time": "",
     "source files": {
-        "version": "v2.5.1-2-g1966cb5",
-        "commit": "1966cb5d2b1f95107c006d2cf5fc8435a225e100",
+        "version": "v2.5.1-3-g613e169",
+        "commit": "613e16998bf1d6e76baad8e171a9ad5d23a790c3",
         "dirty": false
     },
     "pytex": {
@@ -324,9 +324,9 @@
         {
             "name": "translator-mathematical-categories-dictionary-{language}.dict",
             "source file": "mathematical-categories.pydict",
-            "build time": "2022/01/11 20:46",
-            "source version": "v2.5.1-2-g1966cb5",
-            "source commit hash": "1966cb5d2b1f95107c006d2cf5fc8435a225e100",
+            "build time": "2022/01/11 21:17",
+            "source version": "v2.5.1-3-g613e169",
+            "source commit hash": "613e16998bf1d6e76baad8e171a9ad5d23a790c3",
             "pytex version": "v1.2.0-16-gd1806d9",
             "pytex commit hash": "d1806d970fb0c93ba4d41d0b97efabab5415e984",
             "dirty": false
@@ -344,9 +344,9 @@
         {
             "name": "mkessler-symbindex.sty",
             "source file": "symbindex.pysty3",
-            "build time": "2022/01/11 20:41",
-            "source version": "v2.5.1-1-gda44daa",
-            "source commit hash": "da44daa271827e7dccb05e12f990638b24297b48",
+            "build time": "2022/01/11 21:17",
+            "source version": "v2.5.1-3-g613e169",
+            "source commit hash": "613e16998bf1d6e76baad8e171a9ad5d23a790c3",
             "pytex version": "v1.2.0-16-gd1806d9",
             "pytex commit hash": "d1806d970fb0c93ba4d41d0b97efabab5415e984",
             "dirty": false
diff --git a/utils/mkessler-symbindex.sty b/utils/mkessler-symbindex.sty
index 6cd69b9..d60717c 100644
--- a/utils/mkessler-symbindex.sty
+++ b/utils/mkessler-symbindex.sty
@@ -27,7 +27,7 @@
 % 
 % Build details:
 %   PyTeX version: v1.2.0-16-gd1806d9 (commit d1806d9)
-%   Source code version: v2.5.1-1-gda44daa (commit da44daa)
+%   Source code version: v2.5.1-3-g613e169 (commit 613e169)
 % 
 % This LaTeX package is free software and distributed under the MIT License. You
 % may use it freely for your purposes. The latest version of the package can be
@@ -38,7 +38,7 @@
 % at the Git repository for further information.
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-\ProvidesExplPackage{mkessler-symbindex}{2022/01/11}{v2.5.1-1-gda44daa}{Declaring of math symbols with automatic indexing}
+\ProvidesExplPackage{mkessler-symbindex}{2022/01/11}{v2.5.1-3-g613e169}{Declaring of math symbols with automatic indexing}
 
 
 
@@ -88,7 +88,7 @@
           \bool_gset_true:c { used_#2 }
         }
       }
-    \exp_args:Nc\gdef{#2}
+    \expandafter\protected\expandafter\gdef\csname#2\endcsname
       {
         \use:c { symbol_#2: }
       }
diff --git a/utils/translator-mathematical-categories-dictionary-English.dict b/utils/translator-mathematical-categories-dictionary-English.dict
index debf788..4c6398a 100644
--- a/utils/translator-mathematical-categories-dictionary-English.dict
+++ b/utils/translator-mathematical-categories-dictionary-English.dict
@@ -27,7 +27,7 @@
 % 
 % Build details:
 %   PyTeX version: v1.2.0-16-gd1806d9 (commit d1806d9)
-%   Source code version: v2.5.1-2-g1966cb5 (commit 1966cb5)
+%   Source code version: v2.5.1-3-g613e169 (commit 613e169)
 % 
 % This LaTeX dictionary is free software and distributed under the MIT License. You
 % may use it freely for your purposes. The latest version of the dictionary can be
diff --git a/utils/translator-mathematical-categories-dictionary-German.dict b/utils/translator-mathematical-categories-dictionary-German.dict
index 93310d7..65874fe 100644
--- a/utils/translator-mathematical-categories-dictionary-German.dict
+++ b/utils/translator-mathematical-categories-dictionary-German.dict
@@ -27,7 +27,7 @@
 % 
 % Build details:
 %   PyTeX version: v1.2.0-16-gd1806d9 (commit d1806d9)
-%   Source code version: v2.5.1-2-g1966cb5 (commit 1966cb5)
+%   Source code version: v2.5.1-3-g613e169 (commit 613e169)
 % 
 % This LaTeX dictionary is free software and distributed under the MIT License. You
 % may use it freely for your purposes. The latest version of the dictionary can be