diff --git a/src/libs/vwidgets/vhighlighter.h b/src/libs/vwidgets/vhighlighter.h
index 778789547..b9603ec70 100644
--- a/src/libs/vwidgets/vhighlighter.h
+++ b/src/libs/vwidgets/vhighlighter.h
@@ -55,7 +55,7 @@ private:
 class VHighlighter : public QSyntaxHighlighter
 {
 public:
-    VHighlighter(QTextDocument *document);
+    explicit VHighlighter(QTextDocument *document);
 
 protected:
     virtual void highlightBlock(const QString &text);
diff --git a/src/libs/vwidgets/vplaintextedit.h b/src/libs/vwidgets/vplaintextedit.h
index 57b484d3c..d257bd4d5 100644
--- a/src/libs/vwidgets/vplaintextedit.h
+++ b/src/libs/vwidgets/vplaintextedit.h
@@ -35,7 +35,7 @@ class VPlainTextEdit : public QPlainTextEdit
 {
     Q_OBJECT
 public:
-    VPlainTextEdit(QWidget * parent = nullptr);
+    explicit VPlainTextEdit(QWidget * parent = nullptr);
     VPlainTextEdit(const QString & text, QWidget * parent = nullptr);
     virtual ~VPlainTextEdit();