diff --git a/src/plugins/cmakeprojectmanager/cmakeproject.cpp b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
index 38dc7e75c1b..8038890ef0e 100644
--- a/src/plugins/cmakeprojectmanager/cmakeproject.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeproject.cpp
@@ -496,6 +496,7 @@ void CMakeBuildTarget::clear()
     includeFiles.clear();
     compilerOptions.clear();
     defines.clear();
+    files.clear();
 }
 
 } // namespace CMakeProjectManager