diff --git a/render.py b/render.py
index cdb9719..952f23c 100644
--- a/render.py
+++ b/render.py
@@ -313,6 +313,7 @@ def render(root, scene, prefix=''):
     for timeline, data in scene.items():
         if timeline == "subtitles":
             path = os.path.join(root, prefix + "front.srt")
+            data = fix_overlaps(data)
             srt = ox.srt.encode(data)
             write_if_new(path, srt, 'b')
             continue
@@ -560,6 +561,17 @@ def get_srt(sub, offset=0):
         sdata["out"] += offset
     return sdata
 
+def fix_overlaps(data):
+    previous = None
+    for sub in data:
+        if previous is None:
+            previous = sub
+        else:
+            if sub['in'] < previous['out']:
+                previous['out'] = sub['in'] - 0.001
+            previous = sub
+    return data
+
 def update_subtitles(options):
     import item.models
 
@@ -592,6 +604,7 @@ def update_subtitles(options):
                     print("could not find vo for %s" % clip['src'])
             offset += clip['duration']
         path = folder / "front.srt"
+        data = fix_overlaps(subs)
         srt = ox.srt.encode(subs)
         write_if_new(str(path), srt, 'b')