diff --git a/python/core/geometry/qgsmultipolygon.sip b/python/core/geometry/qgsmultipolygon.sip
index c53ab77f1b2..65839bd29ab 100644
--- a/python/core/geometry/qgsmultipolygon.sip
+++ b/python/core/geometry/qgsmultipolygon.sip
@@ -22,6 +22,8 @@ class QgsMultiPolygonV2: QgsMultiSurface
     QgsMultiPolygonV2();
     virtual QString geometryType() const;
 
+    virtual void clear();
+
     virtual QgsMultiPolygonV2 *clone() const /Factory/;
 
 
diff --git a/python/core/geometry/qgsmultisurface.sip b/python/core/geometry/qgsmultisurface.sip
index dc62300f0f7..5b2a3106bcd 100644
--- a/python/core/geometry/qgsmultisurface.sip
+++ b/python/core/geometry/qgsmultisurface.sip
@@ -22,6 +22,8 @@ class QgsMultiSurface: QgsGeometryCollection
     QgsMultiSurface();
     virtual QString geometryType() const;
 
+    virtual void clear();
+
     virtual QgsMultiSurface *clone() const /Factory/;
 
     virtual QgsMultiSurface *toCurveType() const /Factory/;
diff --git a/src/core/geometry/qgsmultipolygon.cpp b/src/core/geometry/qgsmultipolygon.cpp
index f5e9fcefc9e..8c9dc717b2e 100644
--- a/src/core/geometry/qgsmultipolygon.cpp
+++ b/src/core/geometry/qgsmultipolygon.cpp
@@ -33,6 +33,12 @@ QString QgsMultiPolygonV2::geometryType() const
   return QStringLiteral( "MultiPolygon" );
 }
 
+void QgsMultiPolygonV2::clear()
+{
+  QgsMultiSurface::clear();
+  mWkbType = QgsWkbTypes::MultiPolygon;
+}
+
 QgsMultiPolygonV2 *QgsMultiPolygonV2::clone() const
 {
   return new QgsMultiPolygonV2( *this );
diff --git a/src/core/geometry/qgsmultipolygon.h b/src/core/geometry/qgsmultipolygon.h
index 105118fa558..7f2edee42a3 100644
--- a/src/core/geometry/qgsmultipolygon.h
+++ b/src/core/geometry/qgsmultipolygon.h
@@ -30,6 +30,7 @@ class CORE_EXPORT QgsMultiPolygonV2: public QgsMultiSurface
   public:
     QgsMultiPolygonV2();
     QString geometryType() const override;
+    void clear() override;
     QgsMultiPolygonV2 *clone() const override SIP_FACTORY;
 
     bool fromWkt( const QString &wkt ) override;
diff --git a/src/core/geometry/qgsmultisurface.cpp b/src/core/geometry/qgsmultisurface.cpp
index 50c4f942363..677855f6c6a 100644
--- a/src/core/geometry/qgsmultisurface.cpp
+++ b/src/core/geometry/qgsmultisurface.cpp
@@ -34,6 +34,12 @@ QString QgsMultiSurface::geometryType() const
   return QStringLiteral( "MultiSurface" );
 }
 
+void QgsMultiSurface::clear()
+{
+  QgsGeometryCollection::clear();
+  mWkbType = QgsWkbTypes::MultiSurface;
+}
+
 QgsMultiSurface *QgsMultiSurface::clone() const
 {
   return new QgsMultiSurface( *this );
diff --git a/src/core/geometry/qgsmultisurface.h b/src/core/geometry/qgsmultisurface.h
index acb5670ace6..47d5bf3179c 100644
--- a/src/core/geometry/qgsmultisurface.h
+++ b/src/core/geometry/qgsmultisurface.h
@@ -30,6 +30,7 @@ class CORE_EXPORT QgsMultiSurface: public QgsGeometryCollection
   public:
     QgsMultiSurface();
     QString geometryType() const override;
+    void clear() override;
     QgsMultiSurface *clone() const override SIP_FACTORY;
     QgsMultiSurface *toCurveType() const override SIP_FACTORY;
     bool fromWkt( const QString &wkt ) override;