diff --git a/gui/codeeditstyledialog.cpp b/gui/codeeditstyledialog.cpp
index e3461bd55..ca970fdc7 100644
--- a/gui/codeeditstyledialog.cpp
+++ b/gui/codeeditstyledialog.cpp
@@ -245,97 +245,97 @@ void StyleEditDialog::setStyleDefaultDark()
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedWidgetFG(QColor& newColor)
+void StyleEditDialog::colorChangedWidgetFG(const QColor& newColor)
 {
     mStyleOutgoing.widgetFGColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedWidgetBG(QColor& newColor)
+void StyleEditDialog::colorChangedWidgetBG(const QColor& newColor)
 {
     mStyleOutgoing.widgetBGColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedHighlightBG(QColor& newColor)
+void StyleEditDialog::colorChangedHighlightBG(const QColor& newColor)
 {
     mStyleOutgoing.highlightBGColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedLineNumFG(QColor& newColor)
+void StyleEditDialog::colorChangedLineNumFG(const QColor& newColor)
 {
     mStyleOutgoing.lineNumFGColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedLineNumBG(QColor& newColor)
+void StyleEditDialog::colorChangedLineNumBG(const QColor& newColor)
 {
     mStyleOutgoing.lineNumBGColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedKeywordFG(QColor& newColor)
+void StyleEditDialog::colorChangedKeywordFG(const QColor& newColor)
 {
     mStyleOutgoing.keywordColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::weightChangedKeyword(QFont::Weight& newWeight)
+void StyleEditDialog::weightChangedKeyword(const QFont::Weight& newWeight)
 {
     mStyleOutgoing.keywordWeight = newWeight;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedClassFG(QColor& newColor)
+void StyleEditDialog::colorChangedClassFG(const QColor& newColor)
 {
     mStyleOutgoing.classColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::weightChangedClass(QFont::Weight& newWeight)
+void StyleEditDialog::weightChangedClass(const QFont::Weight& newWeight)
 {
     mStyleOutgoing.classWeight = newWeight;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedQuoteFG(QColor& newColor)
+void StyleEditDialog::colorChangedQuoteFG(const QColor& newColor)
 {
     mStyleOutgoing.quoteColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::weightChangedQuote(QFont::Weight& newWeight)
+void StyleEditDialog::weightChangedQuote(const QFont::Weight& newWeight)
 {
     mStyleOutgoing.quoteWeight = newWeight;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedCommentFG(QColor& newColor)
+void StyleEditDialog::colorChangedCommentFG(const QColor& newColor)
 {
     mStyleOutgoing.commentColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::weightChangedComment(QFont::Weight& newWeight)
+void StyleEditDialog::weightChangedComment(const QFont::Weight& newWeight)
 {
     mStyleOutgoing.commentWeight = newWeight;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedSymbolFG(QColor& newColor)
+void StyleEditDialog::colorChangedSymbolFG(const QColor& newColor)
 {
     mStyleOutgoing.symbolFGColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::colorChangedSymbolBG(QColor& newColor)
+void StyleEditDialog::colorChangedSymbolBG(const QColor& newColor)
 {
     mStyleOutgoing.symbolBGColor = newColor;
     updateStyle();
 }
 
-void StyleEditDialog::weightChangedSymbol(QFont::Weight& newWeight)
+void StyleEditDialog::weightChangedSymbol(const QFont::Weight& newWeight)
 {
     mStyleOutgoing.symbolWeight = newWeight;
     updateStyle();
diff --git a/gui/codeeditstyledialog.h b/gui/codeeditstyledialog.h
index a9c6066d3..dfe424de1 100644
--- a/gui/codeeditstyledialog.h
+++ b/gui/codeeditstyledialog.h
@@ -42,22 +42,22 @@ public slots:
     void resetStyle();
     void setStyleDefaultLight();
     void setStyleDefaultDark();
-    void colorChangedWidgetFG(QColor& newColor);
-    void colorChangedWidgetBG(QColor& newColor);
-    void colorChangedHighlightBG(QColor& newColor);
-    void colorChangedLineNumFG(QColor& newColor);
-    void colorChangedLineNumBG(QColor& newColor);
-    void colorChangedKeywordFG(QColor& newColor);
-    void weightChangedKeyword(QFont::Weight& newWeight);
-    void colorChangedClassFG(QColor& newColor);
-    void weightChangedClass(QFont::Weight& newWeight);
-    void colorChangedQuoteFG(QColor& newColor);
-    void weightChangedQuote(QFont::Weight& newWeight);
-    void colorChangedCommentFG(QColor& newColor);
-    void weightChangedComment(QFont::Weight& newWeight);
-    void colorChangedSymbolFG(QColor& newColor);
-    void colorChangedSymbolBG(QColor& newColor);
-    void weightChangedSymbol(QFont::Weight& newWeight);
+    void colorChangedWidgetFG(const QColor& newColor);
+    void colorChangedWidgetBG(const QColor& newColor);
+    void colorChangedHighlightBG(const QColor& newColor);
+    void colorChangedLineNumFG(const QColor& newColor);
+    void colorChangedLineNumBG(const QColor& newColor);
+    void colorChangedKeywordFG(const QColor& newColor);
+    void weightChangedKeyword(const QFont::Weight& newWeight);
+    void colorChangedClassFG(const QColor& newColor);
+    void weightChangedClass(const QFont::Weight& newWeight);
+    void colorChangedQuoteFG(const QColor& newColor);
+    void weightChangedQuote(const QFont::Weight& newWeight);
+    void colorChangedCommentFG(const QColor& newColor);
+    void weightChangedComment(const QFont::Weight& newWeight);
+    void colorChangedSymbolFG(const QColor& newColor);
+    void colorChangedSymbolBG(const QColor& newColor);
+    void weightChangedSymbol(const QFont::Weight& newWeight);
 
 private:
     CodeEditorStyle         mStyleIncoming;