diff --git a/arch/blackfin/include/asm/pgtable.h b/arch/blackfin/include/asm/pgtable.h
index dcca3e6d6e808b1423654315912de2f00eedab2e..b8663921d3c10520f5ad68a70ae57980f5063ac3 100644
--- a/arch/blackfin/include/asm/pgtable.h
+++ b/arch/blackfin/include/asm/pgtable.h
@@ -83,8 +83,6 @@ PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);
 #define ZERO_PAGE(vaddr)	virt_to_page(empty_zero_page)
 extern char empty_zero_page[];
 
-extern unsigned int kobjsize(const void *objp);
-
 #define swapper_pg_dir ((pgd_t *) 0)
 /*
  * No page table caches to initialise.