diff --git a/plugins/PostProcessingPlugin/scripts/FilamentChange.py b/plugins/PostProcessingPlugin/scripts/FilamentChange.py
index 1246bc8b43..0fa52de4f1 100644
--- a/plugins/PostProcessingPlugin/scripts/FilamentChange.py
+++ b/plugins/PostProcessingPlugin/scripts/FilamentChange.py
@@ -58,10 +58,10 @@ class FilamentChange(Script):
         color_change = "M600"
         
         if initial_retract is not None and initial_retract > 0.:
-            color_change = color_change + (" E%.2f" % initial_retract)
+            color_change = color_change + (" E-%.2f" % initial_retract)
         
         if later_retract is not None and later_retract > 0.:
-            color_change = color_change + (" L%.2f" % later_retract)
+            color_change = color_change + (" L-%.2f" % later_retract)
         
         color_change = color_change + " ; Generated by FilamentChange plugin"