diff --git a/lib/lib.h b/lib/lib.h
index c111aeb0e..2714ad3d4 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -119,7 +119,7 @@ void xaccess(char *path, int flags);
 void xunlink(char *path);
 int xcreate(char *path, int flags, int mode);
 int xopen(char *path, int flags);
-void xpipe(int pp);
+void xpipe(int *pp);
 void xclose(int fd);
 int xdup(int fd);
 FILE *xfdopen(int fd, char *mode);
diff --git a/lib/xwrap.c b/lib/xwrap.c
index 76b0ff379..78103555d 100644
--- a/lib/xwrap.c
+++ b/lib/xwrap.c
@@ -310,7 +310,7 @@ int xopen(char *path, int flags)
   return xcreate(path, flags, 0);
 }
 
-void xpipe(int pp)
+void xpipe(int *pp)
 {
   if (pipe(pp)) perror_exit("xpipe");
 }