1 files changed, 1 insertions, 0 deletions

diff --git a/io.c b/io.c
index 043a66552b..a7e1047e7b 100644
--- a/io.c
+++ b/io.c
@@ -275,6 +275,7 @@ ruby_dup(orig)
     return fd;
 }
 
+static VALUE io_alloc _((VALUE));
 static VALUE
 io_alloc(klass)
     VALUE klass;