diff --git a/manimlib/mobject/number_line.py b/manimlib/mobject/number_line.py
index f98b0a0e..9f9bc4d0 100644
--- a/manimlib/mobject/number_line.py
+++ b/manimlib/mobject/number_line.py
@@ -164,7 +164,7 @@ class NumberLine(Line):
         **number_config
     ) -> DecimalNumber:
         number_config = merge_dicts_recursively(
-            self.decimal_number_config, number_config,
+            number_config, self.decimal_number_config,
         )
         if direction is None:
             direction = self.line_to_number_direction