diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index 9caadbdff6..3da0a68c95 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -554,12 +554,16 @@ class StartSliceJob(Job):
         start_gcode = settings["machine_start_gcode"]
         # Remove all the comments from the start g-code
         start_gcode = re.sub(r";.+?(\n|$)", "\n", start_gcode)
-        bed_temperature_settings = ["material_bed_temperature", "material_bed_temperature_layer_0"]
-        pattern = r"\{(%s)(,\s?\w+)?\}" % "|".join(bed_temperature_settings) # match {setting} as well as {setting, extruder_nr}
-        settings["material_bed_temp_prepend"] = re.search(pattern, start_gcode) == None
-        print_temperature_settings = ["material_print_temperature", "material_print_temperature_layer_0", "default_material_print_temperature", "material_initial_print_temperature", "material_final_print_temperature", "material_standby_temperature", "print_temperature"]
-        pattern = r"\{(%s)(,\s?\w+)?\}" % "|".join(print_temperature_settings) # match {setting} as well as {setting, extruder_nr}
-        settings["material_print_temp_prepend"] = re.search(pattern, start_gcode) is None
+
+        if settings["material_bed_temp_prepend"]:
+            bed_temperature_settings = ["material_bed_temperature", "material_bed_temperature_layer_0"]
+            pattern = r"\{(%s)(,\s?\w+)?\}" % "|".join(bed_temperature_settings) # match {setting} as well as {setting, extruder_nr}
+            settings["material_bed_temp_prepend"] = re.search(pattern, start_gcode) == None
+
+        if settings["material_print_temp_prepend"]:
+            print_temperature_settings = ["material_print_temperature", "material_print_temperature_layer_0", "default_material_print_temperature", "material_initial_print_temperature", "material_final_print_temperature", "material_standby_temperature", "print_temperature"]
+            pattern = r"\{(%s)(,\s?\w+)?\}" % "|".join(print_temperature_settings) # match {setting} as well as {setting, extruder_nr}
+            settings["material_print_temp_prepend"] = re.search(pattern, start_gcode) is None
 
         # Replace the setting tokens in start and end g-code.
         # Use values from the first used extruder by default so we get the expected temperatures