diff --git a/services/web/frontend/js/features/source-editor/languages/latex/latex-language.ts b/services/web/frontend/js/features/source-editor/languages/latex/latex-language.ts
index 7fa86ac275..ffa0b6299c 100644
--- a/services/web/frontend/js/features/source-editor/languages/latex/latex-language.ts
+++ b/services/web/frontend/js/features/source-editor/languages/latex/latex-language.ts
@@ -135,7 +135,7 @@ export const LaTeXLanguage = LRLanguage.define({
           ['UsePackage'],
           ['FigureEnvironment', 'BeginEnv'],
         ],
-        ShortTextArgument: [['Date']],
+        ShortTextArgument: [['Date'], ['SetLengthCommand']],
         TextArgument: [['TabularEnvironment', 'BeginEnv']],
       }),
       // TODO: does this override groups defined in the grammar?
diff --git a/services/web/frontend/js/features/source-editor/lezer-latex/latex.grammar b/services/web/frontend/js/features/source-editor/lezer-latex/latex.grammar
index f3f21326a8..c9c155deca 100644
--- a/services/web/frontend/js/features/source-editor/lezer-latex/latex.grammar
+++ b/services/web/frontend/js/features/source-editor/lezer-latex/latex.grammar
@@ -107,7 +107,8 @@
     TextSubscriptCtrlSeq,
     TextStrikeOutCtrlSeq,
     EmphasisCtrlSeq,
-    UnderlineCtrlSeq
+    UnderlineCtrlSeq,
+    SetLengthCtrlSeq
 }
 
 @external specialize {EnvName} specializeEnvName from "./tokens.mjs" {
@@ -406,6 +407,9 @@ KnownCommand<ArgumentType> {
     } |
     UnderlineCommand {
         UnderlineCtrlSeq ArgumentType
+    } |
+    SetLengthCommand {
+        SetLengthCtrlSeq optionalWhitespace? ShortTextArgument optionalWhitespace? ShortTextArgument
     }
 }
 
diff --git a/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs b/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs
index 2167923a8d..933f2fc9a9 100644
--- a/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs
+++ b/services/web/frontend/js/features/source-editor/lezer-latex/tokens.mjs
@@ -98,6 +98,7 @@ import {
   TextStrikeOutCtrlSeq,
   EmphasisCtrlSeq,
   UnderlineCtrlSeq,
+  SetLengthCtrlSeq,
 } from './latex.terms.mjs'
 
 const MAX_ARGUMENT_LOOKAHEAD = 100
@@ -603,6 +604,7 @@ const otherKnowncommands = {
   '\\sout': TextStrikeOutCtrlSeq,
   '\\emph': EmphasisCtrlSeq,
   '\\underline': UnderlineCtrlSeq,
+  '\\setlength': SetLengthCtrlSeq,
 }
 // specializer for control sequences
 // return new tokens for specific control sequences