diff --git a/man-pages-posix-2013-a/man3p/pthread_once.3p b/man-pages-posix-2013-a/man3p/pthread_once.3p
index 316b1e9..db83d63 100644
--- a/man-pages-posix-2013-a/man3p/pthread_once.3p
+++ b/man-pages-posix-2013-a/man3p/pthread_once.3p
@@ -86,7 +86,7 @@ on entry to a routine, as follows:
 .nf
 \fB
 static int random_is_initialized = 0;
-extern int initialize_random();
+extern void initialize_random();
 .P
 int random_function()
 {
@@ -125,7 +125,7 @@ becomes:
 \fB
 #include <pthread.h>
 static pthread_once_t random_is_initialized = PTHREAD_ONCE_INIT;
-extern int initialize_random();
+extern void initialize_random();
 .P
 int random_function()
 {