diff --git a/src/jp2image.cpp b/src/jp2image.cpp
index f63da3b42c..a4faf4160e 100644
--- a/src/jp2image.cpp
+++ b/src/jp2image.cpp
@@ -511,7 +511,7 @@ namespace Exiv2
                                 out << Internal::stringFormat("%8ld | %8ld |  sub:", (size_t)address,
                                                               (size_t)subBox.length)
                                     << toAscii(subBox.type) << " | "
-                                    << Internal::binaryToString(makeSlice(data, 0, 30));
+                                    << Internal::binaryToString(makeSlice(data, 0, std::min(30l, data.size_)));
                                 bLF = true;
                             }