diff --git a/man2/tkill.2 b/man2/tkill.2
index 6ff930e17..6e1afcd36 100644
--- a/man2/tkill.2
+++ b/man2/tkill.2
@@ -39,7 +39,7 @@ tkill, tgkill \- send a signal to a thread
 .PP
 .B #include <signal.h>
 .PP
-.BI "int tgkill, pid_t " tgid ", pid_t " tid ", int " sig );
+.BI "int tgkill(pid_t " tgid ", pid_t " tid ", int " sig );
 .fi
 .PP
 .IR Note :