diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index e500034..83bff05 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -69,7 +69,7 @@
 
 extern ssize_t __init pcpu_embed_first_chunk(
 				size_t static_size, size_t reserved_size,
-				ssize_t dyn_size, ssize_t unit_size);
+				ssize_t dyn_size);
 
 /*
  * Use this to get to a cpu's version of the per-cpu object