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diff --git a/src/live_effects/lpe-interpolate.h b/src/live_effects/lpe-interpolate.h
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+++ b/src/live_effects/lpe-interpolate.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_LPE_INTERPOLATE_H
+#define INKSCAPE_LPE_INTERPOLATE_H
+
+/** \file
+ * LPE interpolate implementation, see lpe-interpolate.cpp.
+ */
+
+/*
+ * Authors:
+ *   Johan Engelen
+ *
+ * Copyright (C) Johan Engelen 2007-2008 <j.b.c.engelen@utwente.nl>
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/effect.h"
+#include "live_effects/parameter/bool.h"
+#include "live_effects/parameter/parameter.h"
+#include "live_effects/parameter/path.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+class LPEInterpolate : public Effect {
+  public:
+    LPEInterpolate(LivePathEffectObject *lpeobject);
+    ~LPEInterpolate() override;
+
+    bool doOnOpen(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 resetDefaults(SPItem const *item) override;
+
+  private:
+    PathParam trajectory_path;
+    ScalarParam number_of_steps;
+    BoolParam equidistant_spacing;
+
+    Geom::Piecewise<Geom::D2<Geom::SBasis> > calculate_trajectory(Geom::OptRect bounds_A, Geom::OptRect bounds_B);
+
+    LPEInterpolate(const LPEInterpolate &) = delete;
+    LPEInterpolate &operator=(const LPEInterpolate &) = delete;
+};
+
+} // namespace LivePathEffect
+} // namespace Inkscape
+
+#endif // INKSCAPE_LPE_INTERPOLATE_H
+
+/*
+  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 :