diff --git a/rustfmt.toml b/rustfmt.toml
index 6776a8829..797eccdad 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -2,3 +2,5 @@ max_width = 120
 comment_width = 100
 match_block_trailing_comma = true
 wrap_comments = true
+
+error_on_line_overflow = true