diff --git a/src/indexing/vocab/vocab.pysty b/src/indexing/vocab/vocab.pysty
index 47dc082..909e4ff 100644
--- a/src/indexing/vocab/vocab.pysty
+++ b/src/indexing/vocab/vocab.pysty
@@ -21,25 +21,25 @@ __IF__(index)
     %Emphasize \vocabulary
     \RequirePackage{expl3}
     \ExplSyntaxOn
-    \NewDocumentCommand{\vocab}{O{} m}{
+    \NewDocumentCommand{\vocab}{O{} m}{%
         \textbf{\color{blue} #2}%
         \if\relax\detokenize{#1}\relax%
         \index[vocabindex]{\text_titlecase_first:n{#2}} % true branch: #1 was empty
-        \else
+        \else%
         \index[vocabindex]{#1} % false branch: #1 was supplied
-        \fi
+        \fi%
     }
     \ExplSyntaxOff
-    \newcommand\printvocabindex{
-        \printindex[vocabindex]
+    \newcommand\printvocabindex{%
+        \printindex[vocabindex]%
     }
     \NewDocumentCommand{\PrintVocabIndex}{ }
-    {
-        \printindex[vocabindex]
+    {%
+        \printindex[vocabindex]%
     }
 \else
-    \NewDocumentCommand{\vocab}{O{} m }{
-        \textbf{\color{blue} #2}
-    }
+    \NewDocumentCommand{\vocab}{O{} m }{%
+        \textbf{\color{blue} #2}%
+    }%
 \fi