diff --git a/src/libslic3r/GCode/SpiralVase.cpp b/src/libslic3r/GCode/SpiralVase.cpp
index c8df9fb2da..acb6ad0348 100644
--- a/src/libslic3r/GCode/SpiralVase.cpp
+++ b/src/libslic3r/GCode/SpiralVase.cpp
@@ -25,11 +25,11 @@ std::string SpiralVase::process_layer(const std::string &gcode)
     float total_layer_length = 0;
     float layer_height = 0;
     float z = 0.f;
-    bool set_z = false;
     
     {
         //FIXME Performance warning: This copies the GCodeConfig of the reader.
         GCodeReader r = m_reader;  // clone
+        bool set_z = false;
         r.parse_buffer(gcode, [&total_layer_length, &layer_height, &z, &set_z]
             (GCodeReader &reader, const GCodeReader::GCodeLine &line) {
             if (line.cmd_is("G1")) {
@@ -50,7 +50,11 @@ std::string SpiralVase::process_layer(const std::string &gcode)
     z -= layer_height;
     
     std::string new_gcode;
-    bool  transition = m_transition_layer;
+    //FIXME Tapering of the transition layer only works reliably with relative extruder distances.
+    // For absolute extruder distances it will be switched off.
+    // Tapering the absolute extruder distances requires to process every extrusion value after the first transition
+    // layer.
+    bool  transition = m_transition_layer && m_config->use_relative_e_distances.value;
     float layer_height_factor = layer_height / total_layer_length;
     float len = 0.f;
     m_reader.parse_buffer(gcode, [&new_gcode, &z, total_layer_length, layer_height_factor, transition, &len]