1 files changed, 1 insertions, 1 deletions
diff --git a/thread.c b/thread.c
index a96806d773..5bf5299221 100644
--- a/thread.c
+++ b/thread.c
@@ -1998,7 +1998,7 @@ struct thgroup {
  *  were created.
  */
 
-static VALUE thgroup_s_alloc _((VALUE));
+static VALUE thgroup_s_alloc(VALUE);
 static VALUE
 thgroup_s_alloc(VALUE klass)
 {