diff --git a/dev_tools/conf/mypy-next.ini b/dev_tools/conf/mypy-next.ini
index ddc541248a6..16d62016c5e 100644
--- a/dev_tools/conf/mypy-next.ini
+++ b/dev_tools/conf/mypy-next.ini
@@ -1,4 +1,5 @@
 [mypy]
+show_error_codes = true
 
 [mypy-__main__]
 follow_imports = silent
diff --git a/dev_tools/conf/mypy.ini b/dev_tools/conf/mypy.ini
index 463b1ec7b4b..1ed669a5be4 100644
--- a/dev_tools/conf/mypy.ini
+++ b/dev_tools/conf/mypy.ini
@@ -1,4 +1,5 @@
 [mypy]
+show_error_codes = true
 
 [mypy-__main__]
 follow_imports = silent