diff --git a/include/asm-powerpc/mmu-44x.h b/include/asm-powerpc/mmu-44x.h
index c8b02d97f753..a825524c981a 100644
--- a/include/asm-powerpc/mmu-44x.h
+++ b/include/asm-powerpc/mmu-44x.h
@@ -53,6 +53,8 @@
 
 #ifndef __ASSEMBLY__
 
+extern unsigned int tlb_44x_hwater;
+
 typedef struct {
 	unsigned long id;
 	unsigned long vdso_base;