diff --git a/src/plugins/python/pythonbuildsystem.cpp b/src/plugins/python/pythonbuildsystem.cpp
index e46e33497bc..717395e6aa4 100644
--- a/src/plugins/python/pythonbuildsystem.cpp
+++ b/src/plugins/python/pythonbuildsystem.cpp
@@ -129,6 +129,16 @@ PythonBuildSystem::PythonBuildSystem(PythonBuildConfiguration *buildConfig)
     requestParse();
 }
 
+PythonBuildSystem::PythonBuildSystem(ProjectExplorer::Target *target)
+    : BuildSystem(target)
+{
+    connect(project(),
+            &Project::projectFileIsDirty,
+            this,
+            &PythonBuildSystem::requestDelayedParse);
+    requestParse();
+}
+
 bool PythonBuildSystem::supportsAction(Node *context, ProjectAction action, const Node *node) const
 {
     if (node->asFileNode())  {
diff --git a/src/plugins/python/pythonbuildsystem.h b/src/plugins/python/pythonbuildsystem.h
index 9729ac3fe50..adf69640790 100644
--- a/src/plugins/python/pythonbuildsystem.h
+++ b/src/plugins/python/pythonbuildsystem.h
@@ -13,6 +13,7 @@ class PythonBuildSystem : public ProjectExplorer::BuildSystem
 {
 public:
     explicit PythonBuildSystem(PythonBuildConfiguration *buildConfig);
+    explicit PythonBuildSystem(ProjectExplorer::Target *target);
 
     bool supportsAction(ProjectExplorer::Node *context,
                         ProjectExplorer::ProjectAction action,
diff --git a/src/plugins/python/pythonproject.cpp b/src/plugins/python/pythonproject.cpp
index 316e35d2620..02eafcbcff3 100644
--- a/src/plugins/python/pythonproject.cpp
+++ b/src/plugins/python/pythonproject.cpp
@@ -23,6 +23,8 @@ PythonProject::PythonProject(const FilePath &fileName)
     setId(PythonProjectId);
     setProjectLanguages(Context(ProjectExplorer::Constants::PYTHON_LANGUAGE_ID));
     setDisplayName(fileName.completeBaseName());
+
+    setBuildSystemCreator([](Target *t) { return new PythonBuildSystem(t); });
 }
 
 Project::RestoreResult PythonProject::fromMap(const Store &map, QString *errorMessage)