diff --git a/ChangeLog b/ChangeLog
index e589d9243..61e3accf6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -232,6 +232,8 @@
    Boeckel).
  + Fixed problem with DOM-checking the 'limit' pseudo-attribute (thanks to
    Barton Meeks).
+ + Fixed problem with duplicate 'project changed' messages (thanks to Owen
+   Clarke).
 
 ------ old releases ------------------------------
 
diff --git a/src/helpers.cpp b/src/helpers.cpp
index ae74040f4..4fc7d345d 100644
--- a/src/helpers.cpp
+++ b/src/helpers.cpp
@@ -164,6 +164,9 @@ std::string onProjectChange (Task& task, bool scope /* = true */)
 ///////////////////////////////////////////////////////////////////////////////
 std::string onProjectChange (Task& task1, Task& task2)
 {
+  if (task1.get ("project") == task2.get ("project"))
+    return onProjectChange (task1);
+
   std::string messages = onProjectChange (task1);
   messages            += onProjectChange (task2);