diff --git a/src/libs/solutions/tasking/tasktree.cpp b/src/libs/solutions/tasking/tasktree.cpp
index dd8956bc61f..5bf173570e7 100644
--- a/src/libs/solutions/tasking/tasktree.cpp
+++ b/src/libs/solutions/tasking/tasktree.cpp
@@ -1631,7 +1631,7 @@ public:
     std::unique_ptr<TaskInterface> m_task = {}; // Owning.
 };
 
-bool isProgressive(RuntimeContainer *container)
+static bool isProgressive(RuntimeContainer *container)
 {
     RuntimeIteration *iteration = container->m_parentTask->m_parentIteration;
     return iteration ? iteration->m_isProgressive : true;