diff --git a/xorriso/text_io.c b/xorriso/text_io.c
index 6524b321..c1ff9a7b 100644
--- a/xorriso/text_io.c
+++ b/xorriso/text_io.c
@@ -2060,7 +2060,8 @@ int Xorriso_pacifier_callback(struct XorrisO *xorriso, char *what_done,
      if(since > 0)
        speed= count / since;
    } else if(count >= xorriso->pacifier_prev_count) {
-     speed= (count - xorriso->pacifier_prev_count) / (interval_time);
+     if(interval_time > 0)
+       speed= (count - xorriso->pacifier_prev_count) / interval_time;
    }
  }
  if(speed >= 0.0) {
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index b2f9c7b2..a96b89a1 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2012.01.23.104642"
+#define Xorriso_timestamP "2012.01.25.153732"