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diff --git a/datalink.c b/datalink.c
index a2bdc70..6a37179 100644
--- a/datalink.c
+++ b/datalink.c
@@ -107,6 +107,9 @@ static void print_progress(int done, int total)
 	printf("%06x/%06x |", done, total);
 
 	step = total / 20;
+	if (step <= 0)
+		step = 1;
+
 	for (i = step; i <= total; i += step)
 		printf("%c", done >= i ? '=' : '-');
 	printf("| %3d%%", done * 100 / total);