diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 9951010230..04d2ad2cf0 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -5185,10 +5185,15 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
         return lerp(m_nominal_z - height, m_nominal_z, z_ratio);
     };
 
+    bool slope_need_z_travel = false;
+    if (sloped != nullptr && !sloped->is_flat()) {
+        auto target_z = get_sloped_z(sloped->slope_begin.z_ratio);
+        slope_need_z_travel = m_writer.will_move_z(target_z);
+    }
     // go to first point of extrusion path
     //BBS: path.first_point is 2D point. But in lazy raise case, lift z is done in travel_to function.
     //Add m_need_change_layer_lift_z when change_layer in case of no lift if m_last_pos is equal to path.first_point() by chance
-    if (!m_last_pos_defined || m_last_pos != path.first_point() || m_need_change_layer_lift_z || (sloped != nullptr && !sloped->is_flat())) {
+    if (!m_last_pos_defined || m_last_pos != path.first_point() || m_need_change_layer_lift_z || slope_need_z_travel) {
         gcode += this->travel_to(
             path.first_point(),
             path.role(),