diff --git a/README b/README
index 87d118c..76a9141 100644
--- a/README
+++ b/README
@@ -1,3 +1,9 @@
+==============================================================================
+Now it should be working on 32 bits systems (only possible issues 
+should be on some prints).
+Further testing is needed though
+==============================================================================
+
 ZMap is a fast network scanner designed for Internet-wide network surveys. On a
 typical desktop computer with a gigabit Ethernet connection, ZMap is capable
 scanning the entire public IPv4 address space in under 45 minutes.
diff --git a/lib/blacklist.c b/lib/blacklist.c
index 9647e4b..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 << 32));
+			  allowed, allowed*100./((long long int)1 << 32));
 	return 0;
 }
diff --git a/src/zmap.c b/src/zmap.c
index 9ebab9e..ca3d495 100644
--- a/src/zmap.c
+++ b/src/zmap.c
@@ -81,7 +81,7 @@ static void *start_mon(__attribute__((unused)) void *arg)
 #define SI(w,x,y) printf("%s\t%s\t%i\n", w, x, y);
 #define SD(w,x,y) printf("%s\t%s\t%f\n", w, x, y);
 #define SU(w,x,y) printf("%s\t%s\t%u\n", w, x, y);
-#define SLU(w,x,y) printf("%s\t%s\t%lu\n", w, x, y);
+#define SLU(w,x,y) printf("%s\t%s\t%lu\n", w, x, (long unsigned int)y);
 #define SS(w,x,y) printf("%s\t%s\t%s\n", w, x, y);
 #define STRTIME_LEN 1024
 
@@ -458,7 +458,7 @@ int main(int argc, char *argv[])
 		}
 		if (end[0] == '%' && end[1] == '\0') {
 			// treat as percentage
-			v = v * (1L << 32) / 100.;
+			v = v * ((unsigned long long int)1 << 32) / 100.;
 		} else if (end[0] != '\0') {
 			fprintf(stderr, "%s: extra characters after max-targets\n",
 				  CMDLINE_PARSER_PACKAGE);
@@ -467,7 +467,7 @@ int main(int argc, char *argv[])
 		if (v <= 0) {
 			zconf.max_targets = 0;
 		}
-		else if (v >= (1L << 32)) {
+		else if (v >= ((unsigned long long int)1 << 32)) {
 			zconf.max_targets = 0xFFFFFFFF;
 		} else {
 			zconf.max_targets = v;