diff --git a/compiler/src/dotty/tools/dotc/parsing/Scanners.scala b/compiler/src/dotty/tools/dotc/parsing/Scanners.scala
index d977b084a14d..5da8db6a91c8 100644
--- a/compiler/src/dotty/tools/dotc/parsing/Scanners.scala
+++ b/compiler/src/dotty/tools/dotc/parsing/Scanners.scala
@@ -601,7 +601,9 @@ object Scanners {
       case r: Indented
       if !r.isOutermost
          && closingRegionTokens.contains(token)
-         && !(token == CASE && r.prefix == MATCH) =>
+         && !(token == CASE && r.prefix == MATCH)
+         && next.token == EMPTY  // can be violated for ill-formed programs, e.g. neg/i12605.sala
+      =>
         currentRegion = r.enclosing
         insert(OUTDENT, offset)
       case _ =>
diff --git a/tests/neg/i12605.scala b/tests/neg/i12605.scala
new file mode 100644
index 000000000000..bcd7aedc606b
--- /dev/null
+++ b/tests/neg/i12605.scala
@@ -0,0 +1,4 @@
+object Foo:
+  def joe(): List[(Int, Int)] =
+    List((2, 3), (3, 4)).filter case (a, b) => b > a // error // error
+// error
\ No newline at end of file