diff --git a/include/asm-m68knommu/bitops.h b/include/asm-m68knommu/bitops.h
index f95e32b..c42f88a 100644
--- a/include/asm-m68knommu/bitops.h
+++ b/include/asm-m68knommu/bitops.h
@@ -259,7 +259,7 @@
 #define find_first_bit(addr, size) \
         find_next_bit((addr), (size), 0)
 
-static __inline__ int find_next_zero_bit (void * addr, int size, int offset)
+static __inline__ int find_next_zero_bit (const void * addr, int size, int offset)
 {
 	unsigned long *p = ((unsigned long *) addr) + (offset >> 5);
 	unsigned long result = offset & ~31UL;