1 files changed, 1 insertions, 0 deletions

diff --git a/lib/message.cc b/lib/message.cc
index 8f9e68a..6a5cfd6 100644
--- a/lib/message.cc
+++ b/lib/message.cc
@@ -1,10 +1,11 @@
 #include <algorithm>
 #include <iterator>
+#include <cassert>
 #include <midillo/message.h>
 #include <midillo/util.h>
 #include <midillo/exception.h>
 
 namespace midillo {
     using std::copy;
     using std::ostream_iterator;