diff --git a/mtags/src/main/scala/scala/meta/internal/mtags/JavaToplevelMtags.scala b/mtags/src/main/scala/scala/meta/internal/mtags/JavaToplevelMtags.scala
index 9e6ce7db67e..364d93f424c 100644
--- a/mtags/src/main/scala/scala/meta/internal/mtags/JavaToplevelMtags.scala
+++ b/mtags/src/main/scala/scala/meta/internal/mtags/JavaToplevelMtags.scala
@@ -168,6 +168,10 @@ class JavaToplevelMtags(
     @tailrec
     def quotedLiteral(quote: Char): Token = {
       reader.nextChar()
+
+      if (reader.endCharOffset >= reader.buf.length)
+        throw new RuntimeException("Broken file, quote doesn't end.")
+
       reader.ch match {
         case `quote` => Token.Literal
         case '\\' =>
diff --git a/tests/unit/src/test/scala/tests/JavaToplevelSuite.scala b/tests/unit/src/test/scala/tests/JavaToplevelSuite.scala
index d01d058da76..26f46e8cd55 100644
--- a/tests/unit/src/test/scala/tests/JavaToplevelSuite.scala
+++ b/tests/unit/src/test/scala/tests/JavaToplevelSuite.scala
@@ -66,6 +66,17 @@ class JavaToplevelSuite extends BaseToplevelSuite {
     List("dot/enum/Abc#"),
   )
 
+  check(
+    "broken",
+    """|package dot.enum;
+       |
+       |public class Abc {
+       |  public static final String REFERRER_ORIGIN_HOST = "audit.example.org.apache.hadoop.shaded.org.;
+       |}
+       |""".stripMargin,
+    List("dot/enum/Abc#"),
+  )
+
   check(
     "extends",
     """|package dot.example;