diff --git a/src/qtgui/guiutils.cpp b/src/qtgui/guiutils.cpp
index a501ae35..659ccf35 100644
--- a/src/qtgui/guiutils.cpp
+++ b/src/qtgui/guiutils.cpp
@@ -416,7 +416,7 @@ void rwSettings(bool writing)
     } else {
         vector<string> tl = g_dynconf->getStringEntries<vector>(asbdSk);
         for (const auto& dbd: tl) {
-            prefs.asearchSubdirHist.push_back(u8s2qs(dbd.c_str()));
+            prefs.asearchSubdirHist.push_back(u8s2qs(dbd));
         }
     }
     if (!writing) {
diff --git a/src/qtgui/main.cpp b/src/qtgui/main.cpp
index 89bd9e0c..32576b71 100644
--- a/src/qtgui/main.cpp
+++ b/src/qtgui/main.cpp
@@ -26,12 +26,11 @@
 #include <qthread.h>
 #include <qmessagebox.h>
 #include <qcheckbox.h>
-#include <qcombobox.h>
 #include <QLocale>
 #include <QLibraryInfo>
 #include <QFileDialog>
 #include <QUrl>
-#include <QSettings>
+#include <memory>
 
 #include "rcldb.h"
 #include "rclconfig.h"
@@ -100,7 +99,7 @@ bool maybeOpenDb(string &reason, bool force, bool *maindberror)
     LOGDEB1("maybeOpenDb: force " << force << "\n");
 
     if (force || nullptr == rcldb) {
-        rcldb = std::shared_ptr<Rcl::Db>(new Rcl::Db(theconfig));
+        rcldb = std::make_shared<Rcl::Db>(theconfig);
     }
     rcldb->rmQueryDb("");
     auto edbs = &prefs.activeExtraDbs;
diff --git a/src/qtgui/preview_w.cpp b/src/qtgui/preview_w.cpp
index 43d1e080..1d0d00c9 100644
--- a/src/qtgui/preview_w.cpp
+++ b/src/qtgui/preview_w.cpp
@@ -782,8 +782,9 @@ bool Preview::loadDocInCurrentTab(const Rcl::Doc &idoc, int docnum)
     connect(&lthr, SIGNAL(finished()), &loop, SLOT(quit()));
 
     bool canGetRawText = rcldb && rcldb->storesDocText();
-    auto it = prefs.preferStoredTextMimes.find(idoc.mimetype);
-    bool preferStoredText = (it != prefs.preferStoredTextMimes.end());
+    bool preferStoredText = std::find(prefs.preferStoredTextMimes.begin(),
+                                      prefs.preferStoredTextMimes.end(),
+                                      idoc.mimetype) != prefs.preferStoredTextMimes.end();
     bool loadok{false};
 
     if (!preferStoredText || !canGetRawText) {
diff --git a/src/qtgui/rclm_view.cpp b/src/qtgui/rclm_view.cpp
index 41d5e194..bad6eaff 100644
--- a/src/qtgui/rclm_view.cpp
+++ b/src/qtgui/rclm_view.cpp
@@ -22,6 +22,7 @@
 
 #include <QMessageBox>
 #include <QSettings>
+#include <memory>
 
 #include "qxtconfirmationmessage.h"
 
@@ -75,7 +76,7 @@ void RclMain::viewUrl()
     Rcl::Query *query = new Rcl::Query(rcldb.get());
     DocSequenceDb *src = new DocSequenceDb(
         rcldb, std::shared_ptr<Rcl::Query>(query), "", 
-        std::shared_ptr<Rcl::SearchData>(new Rcl::SearchData));
+        std::make_shared<Rcl::SearchData>());
     m_source = std::shared_ptr<DocSequence>(src);
 
 
diff --git a/src/qtgui/recoll.h b/src/qtgui/recoll.h
index 6214e9fa..6d2d191e 100644
--- a/src/qtgui/recoll.h
+++ b/src/qtgui/recoll.h
@@ -54,7 +54,7 @@ inline std::string qs2u8s(const QString& qs)
 {
     return std::string((const char *)qs.toUtf8());
 }
-inline QString u8s2qs(const std::string us)
+inline QString u8s2qs(const std::string& us)
 {
     return QString::fromUtf8(us.c_str());
 }
diff --git a/src/qtgui/restable.cpp b/src/qtgui/restable.cpp
index 0ea206f5..30311113 100644
--- a/src/qtgui/restable.cpp
+++ b/src/qtgui/restable.cpp
@@ -35,7 +35,6 @@
 #include <QStyledItemDelegate>
 #include <QTextDocument>
 #include <QPainter>
-#include <QSplitter>
 #include <QFileDialog>
 #include <QMessageBox>
 #include <QTimer>
@@ -488,7 +487,7 @@ void RecollModel::sort(int column, Qt::SortOrder order)
         if (!stringlowercmp("date", spec.field) ||
             !stringlowercmp("datetime", spec.field))
             spec.field = "mtime";
-        spec.desc = order == Qt::AscendingOrder ? false : true;
+        spec.desc = (order != Qt::AscendingOrder);
     }
     emit sortDataChanged(spec);
 }
diff --git a/src/qtgui/rtitool.cpp b/src/qtgui/rtitool.cpp
index f4f52c7c..4bc28aa4 100644
--- a/src/qtgui/rtitool.cpp
+++ b/src/qtgui/rtitool.cpp
@@ -24,7 +24,6 @@
 
 #include <string>
 
-#include <QCheckBox>
 #include <QMessageBox>
 
 #include "recoll.h"
diff --git a/src/qtgui/spell_w.cpp b/src/qtgui/spell_w.cpp
index 63ea7b57..63ff1a98 100644
--- a/src/qtgui/spell_w.cpp
+++ b/src/qtgui/spell_w.cpp
@@ -218,8 +218,8 @@ void SpellW::doExpand()
         resTW->setItem(0, 0, new QTableWidgetItem(tr("No expansion found")));
     } else {
         int row = 0;
-
-        if (maxexpand > 0 && int(res.entries.size()) >= maxexpand) {
+        // maxexpand is static const, thus guaranteed to be >0
+        if (int(res.entries.size()) >= maxexpand) {
             resTW->setRowCount(row + 1);
             resTW->setSpan(row, 0, 1, 2);
             resTW->setItem(row++, 0, 
diff --git a/src/qtgui/ssearch_w.cpp b/src/qtgui/ssearch_w.cpp
index 504f5d18..479136b0 100644
--- a/src/qtgui/ssearch_w.cpp
+++ b/src/qtgui/ssearch_w.cpp
@@ -610,7 +610,6 @@ bool SSearch::fromXML(const SSearchDef& fxml)
 
 
     if (!checkExtIndexes(fxml.extindexes)) {
-        std::string asString;
         stringsToString(fxml.extindexes, asString);
         QMessageBox::warning(
             0, "Recoll",
diff --git a/src/qtgui/xmltosd.cpp b/src/qtgui/xmltosd.cpp
index 1def6e37..f3c24e46 100644
--- a/src/qtgui/xmltosd.cpp
+++ b/src/qtgui/xmltosd.cpp
@@ -22,6 +22,8 @@
 #include "guiutils.h"
 #include "log.h"
 #include "xmltosd.h"
+
+#include <memory>
 #include "smallut.h"
 #include "recoll.h"
 #include "picoxml.h"
@@ -51,7 +53,7 @@ public:
             }
             resetTemps();
             // A new search descriptor. Allocate data structure
-            sd = std::shared_ptr<SearchData>(new SearchData);
+            sd = std::make_shared<SearchData>();
             if (!sd) {
                 LOGERR("SDHXMLHandler::startElement: out of memory\n");
                 contentsOk = false;
diff --git a/src/rcldb/stoplist.cpp b/src/rcldb/stoplist.cpp
index e603441b..6f0b46fc 100644
--- a/src/rcldb/stoplist.cpp
+++ b/src/rcldb/stoplist.cpp
@@ -50,7 +50,7 @@ bool StopList::setFile(const string &filename)
 // faster than find() in this case.
 bool StopList::isStop(const string &term) const
 {
-    return m_stops.empty() ? false : m_stops.find(term) != m_stops.end();
+    return !m_stops.empty() && m_stops.find(term) != m_stops.end();
 }
 
 }