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-rw-r--r--libio/cleanup.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/libio/cleanup.c b/libio/cleanup.c
index a0c5052d39..1f316ebb33 100644
--- a/libio/cleanup.c
+++ b/libio/cleanup.c
@@ -4,6 +4,9 @@
 
 typedef void (*voidfunc) __P((void));
 
+/* Prototype.  */
+static void DEFUN_VOID (_IO_register_cleanup);
+
 static void
 DEFUN_VOID(_IO_register_cleanup)
 {