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diff --git a/src/live_effects/lpe-parallel.h b/src/live_effects/lpe-parallel.h
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+++ b/src/live_effects/lpe-parallel.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_LPE_PARALLEL_H
+#define INKSCAPE_LPE_PARALLEL_H
+
+/** \file
+ * LPE <parallel> implementation
+ */
+
+/*
+ * Authors:
+ *   Maximilian Albert
+ *
+ * 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/parameter/point.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+namespace Pl {
+  // we need a separate namespace to avoid clashes with LPEPerpBisector
+  class KnotHolderEntityLeftEnd;
+  class KnotHolderEntityRightEnd;
+}
+
+class LPEParallel : public Effect {
+public:
+    LPEParallel(LivePathEffectObject *lpeobject);
+    ~LPEParallel() override;
+
+    void doOnApply (SPLPEItem const* lpeitem) override;
+
+    Geom::Piecewise<Geom::D2<Geom::SBasis> > doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in) override;
+
+    /* the knotholder entity classes must be declared friends */
+    friend class Pl::KnotHolderEntityLeftEnd;
+    friend class Pl::KnotHolderEntityRightEnd;
+    void addKnotHolderEntities(KnotHolder *knotholder, SPDesktop *desktop, SPItem *item);
+
+private:
+    PointParam offset_pt;
+    ScalarParam length_left;
+    ScalarParam length_right;
+
+    Geom::Point A;
+    Geom::Point B;
+    Geom::Point C;
+    Geom::Point D;
+    Geom::Point M;
+    Geom::Point N;
+    Geom::Point dir;
+
+    LPEParallel(const LPEParallel&) = delete;
+    LPEParallel& operator=(const LPEParallel&) = delete;
+};
+
+} //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 :