diff --git a/src/typescript/Scala.tmLanguage.ts b/src/typescript/Scala.tmLanguage.ts
index 80870a0..e762495 100644
--- a/src/typescript/Scala.tmLanguage.ts
+++ b/src/typescript/Scala.tmLanguage.ts
@@ -480,7 +480,7 @@ export const scalaTmLanguage: TmLanguage = {
           }
         },
         {
-          match: '\\b(?:(case)\\s+)?(class|object)\\s+([^\\s\\{\\(\\[]+)',
+          match: '\\b(?:(case|open)\\s+)?(class|object)\\s+([^\\s\\{\\(\\[]+)',
           captures: {
             '1': {
               name: 'keyword.declaration.scala'
diff --git a/tests/unit/#91.test.scala b/tests/unit/#91.test.scala
new file mode 100644
index 0000000..1c31a69
--- /dev/null
+++ b/tests/unit/#91.test.scala
@@ -0,0 +1,6 @@
+// SYNTAX TEST "source.scala"
+
+    open class A
+//  ^^^^ keyword.declaration.scala
+//       ^^^^^ keyword.declaration.scala
+//             ^ entity.name.class.declaration