diff --git a/lib/libc/gen/signbit.3 b/lib/libc/gen/signbit.3
index b8d4bb779815..9645d0a31be5 100644
--- a/lib/libc/gen/signbit.3
+++ b/lib/libc/gen/signbit.3
@@ -25,7 +25,7 @@
 .\" $FreeBSD$
 .\"
 .Dd February 11, 2003
-.Dt FPCLASSIFY 3
+.Dt SIGNBIT 3
 .Os
 .Sh NAME
 .Nm signbit