--- squashfs-tools/mksquashfs.c
+++ squashfs-tools/mksquashfs.c
@@ -2273,10 +2273,15 @@
 void progress_bar(long long current, long long max, int columns)
 {
 	char rotate_list[] = { '|', '/', '-', '\\' };
-	int max_digits = floor(log10(max)) + 1;
-	int used = max_digits * 2 + 11;
-	int hashes = (current * (columns - used)) / max;
-	int spaces = columns - used - hashes;
+	int max_digits, used, hashes, spaces;
+
+	if (max == 0)
+		return;
+
+	max_digits = floor(log10(max)) + 1;
+	used = max_digits * 2 + 11;
+	hashes = (current * (columns - used)) / max;
+	spaces = columns - used - hashes;
 
 	if(current > max) {
 		printf("%lld %lld\n", current, max);