diff --git a/mpeg/id3v2/id3v2tag.cpp b/mpeg/id3v2/id3v2tag.cpp
index 046db563..7324a3f9 100644
--- a/mpeg/id3v2/id3v2tag.cpp
+++ b/mpeg/id3v2/id3v2tag.cpp
@@ -295,7 +295,7 @@ const FrameList &ID3v2::Tag::frameList() const
   return d->frameList;
 }
 
-const FrameList &ID3v2::Tag::frameList(const ByteVector &frameID)
+const FrameList &ID3v2::Tag::frameList(const ByteVector &frameID) const
 {
   return d->frameListMap[frameID];
 }
diff --git a/mpeg/id3v2/id3v2tag.h b/mpeg/id3v2/id3v2tag.h
index 7308e117..5606c9d9 100644
--- a/mpeg/id3v2/id3v2tag.h
+++ b/mpeg/id3v2/id3v2tag.h
@@ -227,7 +227,7 @@ namespace TagLib {
        *
        * \see frameListMap()
        */
-      const FrameList &frameList(const ByteVector &frameID);
+      const FrameList &frameList(const ByteVector &frameID) const;
 
       /*!
        * Add a frame to the tag.  At this point the tag takes ownership of