diff --git a/src/scan-mp3.c b/src/scan-mp3.c
index 3eee893f..1de189b6 100644
--- a/src/scan-mp3.c
+++ b/src/scan-mp3.c
@@ -971,14 +971,16 @@ int scan_mp3_get_mp3fileinfo(char *file, MP3FILE *pmp3) {
             pmp3->song_length = (int) ((double) file_size * 8. /
                                        (double) fi.bitrate);
 
-        } else {
+        } else if (fi.samplerate ) {
             pmp3->song_length = (int) ((double)(fi.number_of_frames*fi.samples_per_frame*1000.)/
                                        (double) fi.samplerate);
         }
 
         /* back-calculate bitrate from duration */
-        pmp3->bitrate = ((file_size / 1000) * 8) / 
-            (pmp3->song_length / 1000);
+        if(pmp3->song_length) { /* could still be unknown */
+            pmp3->bitrate = ((file_size / 1000) * 8) / 
+                (pmp3->song_length / 1000);
+        }
 
     }
     DPRINTF(E_DBG,L_SCAN," Song Length: %d\n",pmp3->song_length);