diff --git a/doc/maintainers.md b/doc/maintainers.md
index e01a0b73e2..970b09dc02 100644
--- a/doc/maintainers.md
+++ b/doc/maintainers.md
@@ -491,7 +491,7 @@ have commit right, others don't.
 ### typeprof
 * https://github.com/ruby/typeprof
 
-#### debug
+### debug
 * https://github.com/ruby/debug
 
 ## Platform Maintainers