diff --git a/man/ruby.1 b/man/ruby.1
index a6c50bd23a..69acba35fe 100644
--- a/man/ruby.1
+++ b/man/ruby.1
@@ -591,7 +591,8 @@ the following environment variables:
 .Bl -hang -compact -width "RUBY_GC_HEAP_%d_INIT_SLOTS"
 .It Ev RUBY_GC_HEAP_ Ns Ar %d Ns Ev _INIT_SLOTS
 Initial allocation of slots in a specific heap.
-The available heaps can be found in the keys of `GC.stat_heap`.
+The available heaps can be found in the keys of
+.Li GC.stat_heap .
 Introduced in Ruby 3.3.
 .Pp
 .It Ev RUBY_GC_HEAP_FREE_SLOTS