1 files changed, 1 insertions, 0 deletions

diff --git a/src/data.h b/src/data.h
index dfc49fe0..1c35def8 100644
--- a/src/data.h
+++ b/src/data.h
@@ -58,6 +58,7 @@ public:
 
 
 bool operator==(Data const & a, Data const & b);
+bool operator!=(Data const & a, Data const & b);
 
 
 }