diff --git a/docs/libcurl/libcurl-thread.3 b/docs/libcurl/libcurl-thread.3
index f520da3b7..9514d819e 100644
--- a/docs/libcurl/libcurl-thread.3
+++ b/docs/libcurl/libcurl-thread.3
@@ -79,7 +79,7 @@ all handles. Everything will or might work fine except that timeouts are not
 honored during the DNS lookup - which you can work around by building libcurl
 with c-ares or threaded-resolver support. c-ares is a library that provides
 asynchronous name resolves. On some platforms, libcurl simply will not
-function properly multi-threaded unless the \fICURLOPT_NOSIGNAL(3)\f option is
+function properly multi-threaded unless the \fICURLOPT_NOSIGNAL(3)\fP option is
 set.
 .IP "Name resolving"
 \fBgethostby* functions and other system calls.\fP These functions, provided