diff --git a/include/kernel_lib.h b/include/kernel_lib.h
index 1ee2814cbb77b1089a2822a70004f3ecd98d1eee..5bdc74bb27568bf040c02e29562d75d1cb1e6069 100644
--- a/include/kernel_lib.h
+++ b/include/kernel_lib.h
@@ -140,7 +140,7 @@ extern const char *const hash_algo_name[HASH_ALGO__LAST];
 extern const int hash_digest_size[HASH_ALGO__LAST];
 
 /* hash */
-#if __BITB_PER_LONG == 32
+#if __BITS_PER_LONG == 32
 #define GOLDEN_RATIO_PRIME GOLDEN_RATIO_32
 #define hash_long(val, bits) hash_32(val, bits)
 #elif __BITS_PER_LONG == 64