diff --git a/ChangeLog b/ChangeLog
index 25c69fe8c..d54a33d84 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-12-21  Moritz Bunkus  <moritz@bunkus.org>
+
+	* mkvmerge: bug fix: Fix compilation if FLAC is not available. Fix
+	for issue #13.
+
 2011-12-18  Moritz Bunkus  <moritz@bunkus.org>
 
 	* Released v5.2.0.
diff --git a/src/input/r_flac.cpp b/src/input/r_flac.cpp
index 67b47c20a..e00fc9b04 100644
--- a/src/input/r_flac.cpp
+++ b/src/input/r_flac.cpp
@@ -343,17 +343,17 @@ flac_reader_c::identify() {
 #else  // HAVE_FLAC_FORMAT_H
 
 bool
-flac_reader_c::probe_file(mm_io_c *io,
+flac_reader_c::probe_file(mm_io_c *in,
                           uint64_t size) {
   if (4 > size)
     return false;
 
   std::string data;
   try {
-    io->setFilePointer(0, seek_beginning);
-    if (io->read(data, 4) != 4)
+    in->setFilePointer(0, seek_beginning);
+    if (in->read(data, 4) != 4)
       return false;
-    io->setFilePointer(0, seek_beginning);
+    in->setFilePointer(0, seek_beginning);
 
     if (data == "fLaC")
       id_result_container_unsupported(in->get_file_name(), "FLAC");