diff --git a/src/libslic3r/GCode/SeamPlacer.cpp b/src/libslic3r/GCode/SeamPlacer.cpp
index c325e539aa..960b7bfb3e 100644
--- a/src/libslic3r/GCode/SeamPlacer.cpp
+++ b/src/libslic3r/GCode/SeamPlacer.cpp
@@ -297,7 +297,7 @@ boost::variant<Point, Scarf::Scarf> finalize_seam_position(
         Scarf::Scarf scarf{};
         scarf.entire_loop = region->config().scarf_seam_entire_loop;
         scarf.max_segment_length = region->config().scarf_seam_max_segment_length;
-        scarf.start_height = region->config().scarf_seam_start_height.get_abs_value(1.0);
+        scarf.start_height = std::min(region->config().scarf_seam_start_height.get_abs_value(1.0), 1.0);
 
         const double offset{scarf.entire_loop ? 0.0 : region->config().scarf_seam_length.value};
         const std::optional<Geometry::PointOnLine> outter_scarf_start_point{Geometry::offset_along_lines(
diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 9a33bddcec..f5c9746ae6 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -2699,6 +2699,7 @@ void PrintConfigDef::init_fff_params()
     def->tooltip = L("Start height of the scarf joint specified as fraction of the current layer height.");
     def->sidetext = L(" %");
     def->min = 0;
+    def->max = 100;
     def->mode = comAdvanced;
     def->set_default_value(new ConfigOptionPercent(0));