diff --git a/src/core/qgsvectordataprovider.cpp b/src/core/qgsvectordataprovider.cpp
index 654ca2a799d..2d04c1b14ec 100644
--- a/src/core/qgsvectordataprovider.cpp
+++ b/src/core/qgsvectordataprovider.cpp
@@ -700,7 +700,7 @@ bool QgsVectorDataProvider::isDeleteStyleFromDBSupported() const
   return false;
 }
 
-void QgsVectorDataProvider::deleteStyleById( const QString& uri, QString styleId, QString& errCause )
+void QgsVectorDataProvider::deleteStyleById( const QString& uri, QString styleId, QString& errCause ) const
 {
   Q_UNUSED( uri );
   Q_UNUSED( styleId );
diff --git a/src/core/qgsvectordataprovider.h b/src/core/qgsvectordataprovider.h
index 0bdac0a2177..91e73c72812 100644
--- a/src/core/qgsvectordataprovider.h
+++ b/src/core/qgsvectordataprovider.h
@@ -479,7 +479,7 @@ class CORE_EXPORT QgsVectorDataProvider : public QgsDataProvider
     /**
      * Deletes an existing style from the provider
      */
-    virtual void deleteStyleById( const QString& uri, QString styleId, QString& errCause );
+    virtual void deleteStyleById( const QString& uri, QString styleId, QString& errCause ) const;
 
     static QVariant convertValue( QVariant::Type type, const QString& value );
 
diff --git a/src/providers/postgres/qgspostgresprovider.cpp b/src/providers/postgres/qgspostgresprovider.cpp
index 38393659c42..e64047bcb9c 100644
--- a/src/providers/postgres/qgspostgresprovider.cpp
+++ b/src/providers/postgres/qgspostgresprovider.cpp
@@ -4632,12 +4632,8 @@ QGISEXTERN int listStyles( const QString &uri, QStringList &ids, QStringList &na
   return numberOfRelatedStyles;
 }
 
-void QgsPostgresProvider::deleteStyleById( const QString &uri, QString styleId, QString &errCause )
+void QgsPostgresProvider::deleteStyleById( const QString &uri, QString styleId, QString &errCause ) const
 {
-  QgsDebugMsg( "deleteStyleById" );
-  QgsDebugMsg( styleId );
-  QgsDebugMsg( uri );
-
   QgsDataSourceUri dsUri( uri );
 
   QgsPostgresConn *conn = QgsPostgresConn::connectDb( dsUri.connectionInfo( false ), false );
diff --git a/src/providers/postgres/qgspostgresprovider.h b/src/providers/postgres/qgspostgresprovider.h
index c75fd52ccec..9943099bf23 100644
--- a/src/providers/postgres/qgspostgresprovider.h
+++ b/src/providers/postgres/qgspostgresprovider.h
@@ -133,7 +133,7 @@ class QgsPostgresProvider : public QgsVectorDataProvider
     bool isValid() const override;
     virtual bool isSaveAndLoadStyleToDBSupported() const override { return true; }
     virtual bool isDeleteStyleFromDBSupported() const override { return true; }
-    void deleteStyleById( const QString& uri, QString styleId, QString& errCause );
+    void deleteStyleById( const QString& uri, QString styleId, QString& errCause ) const override;
     QgsAttributeList attributeIndexes() const override;
     QgsAttributeList pkAttributeIndexes() const override { return mPrimaryKeyAttrs; }
     QString defaultValueClause( int fieldId ) const override;