diff --git a/ivas_processing_scripts/audiotools/convert/osba.py b/ivas_processing_scripts/audiotools/convert/osba.py
index 5301bf0f0f74e62d064e9d6a5d00fd15b427ce86..5507165717b61ecc640c960761ff9e235cbaef71 100644
--- a/ivas_processing_scripts/audiotools/convert/osba.py
+++ b/ivas_processing_scripts/audiotools/convert/osba.py
@@ -80,7 +80,17 @@ def convert_osba(
         render_sba_to_binaural(sba, out_sba, **kwargs)
 
         # combine results
-        out.audio = out_ism.audio + out_sba.audio
+        try:
+          out.audio = out_ism.audio + out_sba.audio
+        except ValueError as e:
+            if (
+                out_ism.audio.shape[0] != out_sba.audio.shape[0]
+                and out_sba.audio.shape[0] == osba.audio.shape[0]
+            ):
+                out.audio = out_sba.audio
+                out.audio[: out_ism.audio.shape[0], :] += out_ism.audio
+            else:
+                raise e
 
     # OSBA -> CBA
     elif isinstance(out, audio.ChannelBasedAudio):