diff --git a/src/dwarf/line_info.cc b/src/dwarf/line_info.cc
index 1b83e5e6..a3630dbc 100644
--- a/src/dwarf/line_info.cc
+++ b/src/dwarf/line_info.cc
@@ -264,6 +264,9 @@ void LineInfoReader::SeekToOffset(uint64_t offset, uint8_t address_size) {
           }
         }
       }
+      if (file_name.directory_index >= include_directories_.size()) {
+        THROW("directory index out of range");
+      }
       filenames_.push_back(file_name);
     }
   }