diff --git a/src/os_unix.c b/src/os_unix.c
index 8dcf8c7..018c49f 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -159,7 +159,7 @@
 #else
 typedef int waitstatus;
 #endif
-static int  wait4pid __ARGS((pid_t, waitstatus *));
+static pid_t wait4pid __ARGS((pid_t, waitstatus *));
 
 static int  WaitForChar __ARGS((long));
 #if defined(__BEOS__)