diff --git a/include/asm-sparc64/sparsemem.h b/include/asm-sparc64/sparsemem.h
index 77bcd2bfa53c..b99d4e4b6d28 100644
--- a/include/asm-sparc64/sparsemem.h
+++ b/include/asm-sparc64/sparsemem.h
@@ -3,7 +3,7 @@
 
 #ifdef __KERNEL__
 
-#define SECTION_SIZE_BITS       31
+#define SECTION_SIZE_BITS       30
 #define MAX_PHYSADDR_BITS       42
 #define MAX_PHYSMEM_BITS        42