diff --git a/src/hexascii_highlighter.h b/src/hexascii_highlighter.h
index f007da4e..8ccf5018 100644
--- a/src/hexascii_highlighter.h
+++ b/src/hexascii_highlighter.h
@@ -13,7 +13,7 @@ class AsciiHighlighter : public QSyntaxHighlighter
     Q_OBJECT
 
 public:
-    AsciiHighlighter(QTextDocument *parent = 0);
+    explicit AsciiHighlighter(QTextDocument *parent = 0);
 
 protected:
     void highlightBlock(const QString &text);
diff --git a/src/hexhighlighter.h b/src/hexhighlighter.h
index 01b74711..89eeff0d 100644
--- a/src/hexhighlighter.h
+++ b/src/hexhighlighter.h
@@ -13,7 +13,7 @@ class HexHighlighter : public QSyntaxHighlighter
     Q_OBJECT
 
 public:
-    HexHighlighter(QTextDocument *parent = 0);
+    explicit HexHighlighter(QTextDocument *parent = 0);
 
 protected:
     void highlightBlock(const QString &text);
diff --git a/src/mdhighlighter.h b/src/mdhighlighter.h
index 1a5ceca9..60b8fa0b 100644
--- a/src/mdhighlighter.h
+++ b/src/mdhighlighter.h
@@ -13,7 +13,7 @@ class MdHighlighter : public QSyntaxHighlighter
     Q_OBJECT
 
 public:
-    MdHighlighter(QTextDocument *parent = 0);
+    explicit MdHighlighter(QTextDocument *parent = 0);
 
 protected:
     void highlightBlock(const QString &text);
diff --git a/src/qrcore.cpp b/src/qrcore.cpp
index 08c6640a..038a7ff4 100644
--- a/src/qrcore.cpp
+++ b/src/qrcore.cpp
@@ -228,7 +228,7 @@ QJsonDocument QRCore::cmdj(const QString &str)
     return doc;
 }
 
-bool QRCore::loadFile(QString path, uint64_t loadaddr = 0LL, uint64_t mapaddr = 0LL, bool rw = false, int va = 0, int bits = 0, int idx, bool loadbin)
+bool QRCore::loadFile(QString path, uint64_t loadaddr, uint64_t mapaddr, bool rw, int va, int bits, int idx, bool loadbin)
 {
     QNOTUSED(loadaddr);
     QNOTUSED(idx);
@@ -291,7 +291,7 @@ bool QRCore::loadFile(QString path, uint64_t loadaddr = 0LL, uint64_t mapaddr =
         }
 
 #if HAVE_MULTIPLE_RBIN_FILES_INSIDE_SELECT_WHICH_ONE
-        if (!r_core_file_open(core, path.toUtf8(), R_IO_READ | rw ? R_IO_WRITE : 0, mapaddr))
+        if (!r_core_file_open(core, path.toUtf8(), R_IO_READ | (rw ? R_IO_WRITE : 0, mapaddr)))
         {
             eprintf("Cannot open file\n");
         }
@@ -392,6 +392,7 @@ QMap<QString, QList<QList<QString>>> QRCore::getNestedComments()
             tmp << fields[1].split("\"")[1].trimmed();
             tmp << fields[0].trimmed();
             QString fcn_name = this->cmdFunctionAt(fields[0].trimmed());
+            // Why test if you do the same thing?
             if (ret.contains(fcn_name))
             {
                 ret[fcn_name].append(tmp);
@@ -840,7 +841,6 @@ QStringList QRCore::getStats()
 
 QString QRCore::getSimpleGraph(QString function)
 {
-
     // New styles
     QString graph = "graph [bgcolor=invis, splines=polyline];";
     QString node = "node [style=\"filled\" fillcolor=\"#4183D7\" shape=box fontname=\"Courier\" fontsize=\"8\" color=\"#4183D7\" fontcolor=\"white\"];";
diff --git a/src/qrcore.h b/src/qrcore.h
index fe661571..2190fe27 100644
--- a/src/qrcore.h
+++ b/src/qrcore.h
@@ -66,7 +66,7 @@ public:
     QList<QList<QString>> getComments();
     QMap<QString, QList<QList<QString>>> getNestedComments();
     void setOptions(QString key);
-    bool loadFile(QString path, uint64_t loadaddr, uint64_t mapaddr, bool rw, int va, int bits, int idx = 0, bool loadbin = false);
+    bool loadFile(QString path, uint64_t loadaddr = 0LL, uint64_t mapaddr = 0LL, bool rw = false, int va = 0, int bits = 0, int idx = 0, bool loadbin = false);
     bool tryFile(QString path, bool rw);
     void analyze(int level);
     void seek(QString addr);
diff --git a/src/qrdisasm.h b/src/qrdisasm.h
index 8754a5c5..9143e773 100644
--- a/src/qrdisasm.h
+++ b/src/qrdisasm.h
@@ -65,7 +65,7 @@ class QRDisasm
     QRCore *core;
     Sdb *db;
 public:
-    QRDisasm(QRCore *core);
+    explicit QRDisasm(QRCore *core);
     bool disassembleAt(ut64 addr, QRDisasmOption opt, QRDisasmRow &dr);
     // high level api for the disasm thing to manage comments, xrefs, etc
     //next();
diff --git a/src/widgets/importswidget.h b/src/widgets/importswidget.h
index 850d59e0..3cfb00b0 100644
--- a/src/widgets/importswidget.h
+++ b/src/widgets/importswidget.h
@@ -34,7 +34,7 @@ private:
 class CMyDelegate : public QStyledItemDelegate
 {
 public:
-    CMyDelegate(QObject *parent) : QStyledItemDelegate(parent) {}
+    explicit CMyDelegate(QObject *parent) : QStyledItemDelegate(parent) {}
 
     void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const override;
 };
diff --git a/src/widgets/memorywidget.cpp b/src/widgets/memorywidget.cpp
index 0dbdd326..60683552 100644
--- a/src/widgets/memorywidget.cpp
+++ b/src/widgets/memorywidget.cpp
@@ -1482,8 +1482,7 @@ void MemoryWidget::fill_refs(QList<QStringList> refs, QList<QStringList> xrefs,
 void MemoryWidget::fillOffsetInfo(QString off)
 {
     ui->offsetTreeWidget->clear();
-    QString raw = "";
-    raw = this->main->core->getOffsetInfo(off);
+    QString raw = this->main->core->getOffsetInfo(off);
     QList<QString> lines = raw.split("\n", QString::SkipEmptyParts);
     foreach (QString line, lines)
     {
@@ -1769,14 +1768,13 @@ bool MemoryWidget::eventFilter(QObject *obj, QEvent *event)
         QString ele = eles.isEmpty() ? "" : eles[0];
         if (ele.contains("0x"))
         {
-            QString jump = "";
-            jump = this->main->core->getOffsetJump(ele);
-            if (jump != "")
+            QString jump = this->main->core->getOffsetJump(ele);
+            if (!jump.isEmpty())
             {
                 if (jump.contains("0x"))
                 {
                     QString fcn = this->main->core->cmdFunctionAt(jump);
-                    if (fcn != "")
+                    if (!fcn.isEmpty())
                     {
                         this->main->seek(jump.trimmed(), fcn);
                     }
diff --git a/src/widgets/memorywidget.h b/src/widgets/memorywidget.h
index 7faab875..d3d223d9 100644
--- a/src/widgets/memorywidget.h
+++ b/src/widgets/memorywidget.h
@@ -61,7 +61,7 @@ public slots:
 
     void refreshHexdump(const QString &where = QString());
 
-    void fill_refs(QList<QStringList> list, QList<QStringList> xrefs, QList<int> graph_data);
+    void fill_refs(QList<QStringList> refs, QList<QStringList> xrefs, QList<int> graph_data);
 
     void fillOffsetInfo(QString off);
 
diff --git a/src/widgets/pieview.h b/src/widgets/pieview.h
index 0ada5525..435d06d5 100644
--- a/src/widgets/pieview.h
+++ b/src/widgets/pieview.h
@@ -49,7 +49,7 @@ class PieView : public QAbstractItemView
     Q_OBJECT
 
 public:
-    PieView(QWidget *parent = 0);
+    explicit PieView(QWidget *parent = 0);
 
     QRect visualRect(const QModelIndex &index) const;
     void scrollTo(const QModelIndex &index, ScrollHint hint = EnsureVisible);
@@ -85,7 +85,7 @@ protected:
     QRegion visualRegionForSelection(const QItemSelection &selection) const;
 
 private:
-    QRect itemRect(const QModelIndex &item) const;
+    QRect itemRect(const QModelIndex &index) const;
     QRegion itemRegion(const QModelIndex &index) const;
     int rows(const QModelIndex &index = QModelIndex()) const;
     void updateGeometries();