diff --git a/src/plugins/clangcodemodel/clangcompletion.cpp b/src/plugins/clangcodemodel/clangcompletion.cpp
index 96d2da62c2877baf3134299320df2f7ac4fc690e..88c35533713200c26858fdd66bc552ef5d7b4ca5 100644
--- a/src/plugins/clangcodemodel/clangcompletion.cpp
+++ b/src/plugins/clangcodemodel/clangcompletion.cpp
@@ -203,10 +203,9 @@ IAssistProcessor *ClangCompletionAssistProvider::createProcessor() const
 }
 
 IAssistInterface *ClangCompletionAssistProvider::createAssistInterface(
-        ProjectExplorer::Project *project, const QString &filePath,
+        const QString &filePath,
         QTextDocument *document, bool isObjCEnabled, int position, AssistReason reason) const
 {
-    Q_UNUSED(project);
     Q_UNUSED(isObjCEnabled);
 
     CppModelManagerInterface *modelManager = CppModelManagerInterface::instance();
diff --git a/src/plugins/clangcodemodel/clangcompletion.h b/src/plugins/clangcodemodel/clangcompletion.h
index 152439c54aea7a6706414fb18ebe908e8fdf03b4..7a6946bd57c96d19976ebdecc96e44dcd71a87b3 100644
--- a/src/plugins/clangcodemodel/clangcompletion.h
+++ b/src/plugins/clangcodemodel/clangcompletion.h
@@ -44,7 +44,6 @@
 
 #include <QStringList>
 #include <QTextCursor>
-#include <QCoreApplication>
 
 namespace ClangCodeModel {
 
@@ -58,7 +57,7 @@ public:
 
     virtual TextEditor::IAssistProcessor *createProcessor() const;
     virtual TextEditor::IAssistInterface *createAssistInterface(
-            ProjectExplorer::Project *project, const QString &filePath,
+            const QString &filePath,
             QTextDocument *document, bool isObjCEnabled, int position,
             TextEditor::AssistReason reason) const;
 
diff --git a/src/plugins/cppeditor/cppeditor.cpp b/src/plugins/cppeditor/cppeditor.cpp
index abb8286c002ab4ef7f4c23bcc024490859fe5cbb..9eecd71476880fedcfa3dca7272a668478bf6779 100644
--- a/src/plugins/cppeditor/cppeditor.cpp
+++ b/src/plugins/cppeditor/cppeditor.cpp
@@ -613,7 +613,6 @@ IAssistInterface *CppEditorWidget::createAssistInterface(AssistKind kind, Assist
     if (kind == Completion) {
         if (CppCompletionAssistProvider *cap = cppEditorDocument()->completionAssistProvider()) {
             return cap->createAssistInterface(
-                            ProjectExplorer::ProjectExplorerPlugin::currentProject(),
                             textDocument()->filePath(),
                             document(),
                             cppEditorDocument()->isObjCEnabled(),
diff --git a/src/plugins/cpptools/cppcompletionassist.cpp b/src/plugins/cpptools/cppcompletionassist.cpp
index a0a2e2b055644ec1f3e34cb5d24919c552d8b88f..251881a4c9981397f82beda66d148b3637af9c37 100644
--- a/src/plugins/cpptools/cppcompletionassist.cpp
+++ b/src/plugins/cpptools/cppcompletionassist.cpp
@@ -418,10 +418,9 @@ IAssistProcessor *InternalCompletionAssistProvider::createProcessor() const
 }
 
 IAssistInterface *InternalCompletionAssistProvider::createAssistInterface(
-        ProjectExplorer::Project *project, const QString &filePath, QTextDocument *document,
+        const QString &filePath, QTextDocument *document,
         bool isObjCEnabled, int position, AssistReason reason) const
 {
-    Q_UNUSED(project);
     QTC_ASSERT(document, return 0);
 
     CppModelManagerInterface *modelManager = CppModelManagerInterface::instance();
diff --git a/src/plugins/cpptools/cppcompletionassist.h b/src/plugins/cpptools/cppcompletionassist.h
index c385646f6f80b25805fcf4729675bce75a667955..44d5bc8d779ee1931c4a7d3ba187ec38e0f0d814 100644
--- a/src/plugins/cpptools/cppcompletionassist.h
+++ b/src/plugins/cpptools/cppcompletionassist.h
@@ -92,7 +92,7 @@ class InternalCompletionAssistProvider : public CppCompletionAssistProvider
 public:
     TextEditor::IAssistProcessor *createProcessor() const QTC_OVERRIDE;
 
-    TextEditor::IAssistInterface *createAssistInterface(ProjectExplorer::Project *project,
+    TextEditor::IAssistInterface *createAssistInterface(
             const QString &filePath,
             QTextDocument *document,
             bool isObjCEnabled,
diff --git a/src/plugins/cpptools/cppcompletionassistprovider.h b/src/plugins/cpptools/cppcompletionassistprovider.h
index f60c5bb102068ed42f926b06cc9156afd6f30c64..7fc8e3d39b07cadc5f90d88db9dcbb6e7eaefb8c 100644
--- a/src/plugins/cpptools/cppcompletionassistprovider.h
+++ b/src/plugins/cpptools/cppcompletionassistprovider.h
@@ -41,8 +41,6 @@ QT_BEGIN_NAMESPACE
 class QTextDocument;
 QT_END_NAMESPACE
 
-namespace ProjectExplorer { class Project; }
-
 namespace TextEditor {
 class BaseTextEditor;
 class IAssistInterface;
@@ -61,7 +59,7 @@ public:
     bool isContinuationChar(const QChar &c) const QTC_OVERRIDE;
 
     virtual TextEditor::IAssistInterface *createAssistInterface(
-            ProjectExplorer::Project *project, const QString &filePath,
+            const QString &filePath,
             QTextDocument *document, bool isObjCEnabled, int position,
             TextEditor::AssistReason reason) const = 0;