diff --git a/libio/genops.c b/libio/genops.c
index 82c1c444b8..381c45fa5d 100644
--- a/libio/genops.c
+++ b/libio/genops.c
@@ -1021,7 +1021,7 @@ _IO_default_write (fp, data, n)
   return 0;
 }
 
-int
+size_t
 _IO_default_showmanyc (fp)
      _IO_FILE *fp;
 {