diff --git a/lib/blacklist.c b/lib/blacklist.c
index 2b8a70e..49eaa32 100644
--- a/lib/blacklist.c
+++ b/lib/blacklist.c
@@ -124,6 +124,6 @@ int blacklist_init_from_files(char *whitelist_filename, char *blacklist_filename
 	constraint_optimize(constraint);
 	uint64_t allowed = blacklist_count_allowed();
 	log_debug("blacklist", "%lu addresses allowed to be scanned (%0.0f%% of address space)", 
-			  allowed, allowed*100./(1L << (int)sizeof(long)*4));
+			  allowed, allowed*100./((long long int)1 << 32));
 	return 0;
 }