diff --git a/lib/libc/gen/frexp.3 b/lib/libc/gen/frexp.3
index b903182d42e..de1587e788d 100644
--- a/lib/libc/gen/frexp.3
+++ b/lib/libc/gen/frexp.3
@@ -67,7 +67,7 @@ such that
 is a
 .Em double
 with magnitude in the interval
-.Bq 1/2 , 1
+.Bo 1/2 , 1 Pc
 or zero, and
 .Fa value
 equals