1 files changed, 1 insertions, 0 deletions
diff --git a/struct.c b/struct.c
index e22c539fac..56710b676f 100644
--- a/struct.c
+++ b/struct.c
@@ -224,6 +224,7 @@ static VALUE
 rb_struct_s_def(argc, argv, klass)
     int argc;
     VALUE *argv;
+    VALUE klass;
 {
     VALUE name, rest;
     long i;