diff --git a/dlls/winemp3.acm/mpegl3.c b/dlls/winemp3.acm/mpegl3.c
index 2ee84306a10..548483a0dd7 100644
--- a/dlls/winemp3.acm/mpegl3.c
+++ b/dlls/winemp3.acm/mpegl3.c
@@ -192,7 +192,7 @@ static void mp3_horse(PACMDRVSTREAMINSTANCE adsi,
             TRACE("New format: %li Hz, %i channels, encoding value %i\n", rate, channels, enc);
         }
         dpos += size;
-        if (dpos > *ndst) break;
+        if (dpos >= *ndst) break;
     } while (ret != MPG123_ERR && ret != MPG123_NEED_MORE);
     *ndst = dpos;
 }