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diff --git a/src/live_effects/lpe-offset.h b/src/live_effects/lpe-offset.h
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+++ b/src/live_effects/lpe-offset.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_LPE_OFFSET_H
+#define INKSCAPE_LPE_OFFSET_H
+
+/** \file
+ * LPE <offset> implementation, see lpe-offset.cpp.
+ */
+
+/*
+ * Authors:
+ *   Maximilian Albert
+ *   Jabiertxo Arraiza
+ *
+ * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ * Copyright (C) Maximilian Albert 2008 <maximilian.albert@gmail.com>
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/effect.h"
+#include "live_effects/lpegroupbbox.h"
+#include "live_effects/parameter/enum.h"
+#include "live_effects/parameter/parameter.h"
+#include "live_effects/parameter/unit.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+namespace OfS {
+// we need a separate namespace to avoid clashes with other LPEs
+class KnotHolderEntityOffsetPoint;
+}
+
+class LPEOffset : public Effect, GroupBBoxEffect {
+public:
+    LPEOffset(LivePathEffectObject *lpeobject);
+    ~LPEOffset() override;
+    void doBeforeEffect (SPLPEItem const* lpeitem) override;
+    Geom::PathVector doEffect_path (Geom::PathVector const & path_in) override;
+    void transform_multiply(Geom::Affine const &postmul, bool set) override;
+    void addKnotHolderEntities(KnotHolder * knotholder, SPItem * item) override;
+    void addCanvasIndicators(SPLPEItem const *lpeitem, std::vector<Geom::PathVector> &hp_vec) override;
+    void calculateOffset (Geom::PathVector const & path_in);
+    Geom::Point get_default_point(Geom::PathVector pathv) const;
+    Geom::Point get_nearest_point(Geom::PathVector pathv, Geom::Point point)  const;
+    double sp_get_offset(Geom::Point origin);
+    friend class OfS::KnotHolderEntityOffsetPoint;
+
+private:
+    UnitParam unit;
+    ScalarParam offset;
+    EnumParam<unsigned> linejoin_type;
+    ScalarParam miter_limit;
+    BoolParam attempt_force_join;
+    BoolParam update_on_knot_move;
+    Geom::Point offset_pt;
+    Glib::ustring prev_unit;
+    double scale = 1; //take document scale and additional parent transformations into account
+    KnotHolderEntity * _knot_entity;
+    Geom::PathVector filled_rule_pathv;
+    Geom::PathVector helper_path;
+    Inkscape::UI::Widget::Scalar *offset_widget;
+
+    LPEOffset(const LPEOffset&);
+    LPEOffset& operator=(const LPEOffset&);
+};
+
+} //namespace LivePathEffect
+} //namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :