1 files changed, 1 insertions, 1 deletions
diff --git a/cpp/tests/TxBufferTest.cpp b/cpp/tests/TxBufferTest.cpp
index 0573ad15b0..8a9b233eb9 100644
--- a/cpp/tests/TxBufferTest.cpp
+++ b/cpp/tests/TxBufferTest.cpp
@@ -143,7 +143,7 @@ class TxBufferTest : public CppUnit::TestCase
             return state == ABORTED;
         }
         
-        bool isOpen(){
+        bool isOpen() const{
             return state == OPEN;
         }
         ~MockTransactionalStore(){}