diff --git a/src/plugins/clangtools/clangfileinfo.h b/src/plugins/clangtools/clangfileinfo.h
index a543ca1f274..735028a1f9e 100644
--- a/src/plugins/clangtools/clangfileinfo.h
+++ b/src/plugins/clangtools/clangfileinfo.h
@@ -36,12 +36,24 @@ namespace Internal {
 class FileInfo
 {
 public:
+    FileInfo() = default;
+    FileInfo(Utils::FileName file,
+             CppTools::ProjectFile::Kind kind,
+             CppTools::ProjectPart::Ptr projectPart)
+        : file(std::move(file))
+        , kind(kind)
+        , projectPart(projectPart)
+    {}
     Utils::FileName file;
     CppTools::ProjectFile::Kind kind;
     CppTools::ProjectPart::Ptr projectPart;
 };
 
-using FileInfos = QVector<FileInfo>;
+inline bool operator==(const FileInfo &lhs, const FileInfo &rhs) {
+    return lhs.file == rhs.file;
+}
+
+using FileInfos = std::vector<FileInfo>;
 
 } // namespace Internal
 } // namespace ClangTools
diff --git a/src/plugins/clangtools/clangselectablefilesdialog.cpp b/src/plugins/clangtools/clangselectablefilesdialog.cpp
index e9cdc42625c..08ba746553d 100644
--- a/src/plugins/clangtools/clangselectablefilesdialog.cpp
+++ b/src/plugins/clangtools/clangselectablefilesdialog.cpp
@@ -155,7 +155,7 @@ public:
                 return false;
 
             if (!node->isDir)
-                result += static_cast<TreeWithFileInfo *>(node)->info;
+                result.push_back(static_cast<TreeWithFileInfo *>(node)->info);
 
             return true;
         });
@@ -194,7 +194,7 @@ private:
         Tree *projectDirTree = buildProjectDirTree(project->projectDirectory(),
                                                    fileInfos,
                                                    outOfBaseDirFiles);
-        if (outOfBaseDirFiles.isEmpty()) {
+        if (outOfBaseDirFiles.empty()) {
             // Showing the project file and beneath the project dir is pointless in this case,
             // so get rid of the root node and modify the project dir node as the new root node.
             projectDirTree->name = m_root->name;
@@ -229,7 +229,7 @@ private:
 
         for (const FileInfo &fileInfo : fileInfos) {
             if (!fileInfo.file.isChildOf(projectDirNode->fullPath)) {
-                outOfBaseDirFiles += fileInfo;
+                outOfBaseDirFiles.push_back(fileInfo);
                 continue; // Handle these separately.
             }
 
diff --git a/src/plugins/clangtools/clangtidyclazytool.cpp b/src/plugins/clangtools/clangtidyclazytool.cpp
index 2c74837125b..d3f3d841b70 100644
--- a/src/plugins/clangtools/clangtidyclazytool.cpp
+++ b/src/plugins/clangtools/clangtidyclazytool.cpp
@@ -333,7 +333,7 @@ void ClangTidyClazyTool::startTool(bool askUserForFileSelection)
     QTC_ASSERT(project, return);
 
     const FileInfos fileInfos = collectFileInfos(project, askUserForFileSelection);
-    if (fileInfos.isEmpty())
+    if (fileInfos.empty())
         return;
 
     auto clangTool = new ClangTidyClazyRunControl(runControl,
diff --git a/src/plugins/clangtools/clangtool.cpp b/src/plugins/clangtools/clangtool.cpp
index 7c63fa4ee47..248bee44ea0 100644
--- a/src/plugins/clangtools/clangtool.cpp
+++ b/src/plugins/clangtools/clangtool.cpp
@@ -78,13 +78,13 @@ static FileInfos sortedFileInfos(const QVector<CppTools::ProjectPart::Ptr> &proj
                 continue;
 
             if (CppTools::ProjectFile::isSource(file.kind)) {
-                const FileInfo info{Utils::FileName::fromString(file.path), file.kind, projectPart};
-                fileInfos.append(info);
+                fileInfos.emplace_back(Utils::FileName::fromString(file.path), file.kind, projectPart);
             }
         }
     }
 
     Utils::sort(fileInfos, &FileInfo::file);
+    fileInfos.erase(std::unique(fileInfos.begin(), fileInfos.end()), fileInfos.end());
 
     return fileInfos;
 }