diff --git a/unshackle/core/drm/playready.py b/unshackle/core/drm/playready.py
index 7376764..9091833 100644
--- a/unshackle/core/drm/playready.py
+++ b/unshackle/core/drm/playready.py
@@ -415,7 +415,7 @@ class PlayReady:
             p.wait()
 
             if p.returncode != 0 or had_error:
-                raise subprocess.CalledProcessError(p.returncode, arguments)
+                raise subprocess.CalledProcessError(p.returncode, [binaries.ShakaPackager, *arguments])
 
             path.unlink()
             if not stream_skipped:
diff --git a/unshackle/core/drm/widevine.py b/unshackle/core/drm/widevine.py
index 7fee1c9..f4de4bc 100644
--- a/unshackle/core/drm/widevine.py
+++ b/unshackle/core/drm/widevine.py
@@ -371,7 +371,7 @@ class Widevine:
             p.wait()
 
             if p.returncode != 0 or had_error:
-                raise subprocess.CalledProcessError(p.returncode, arguments)
+                raise subprocess.CalledProcessError(p.returncode, [binaries.ShakaPackager, *arguments])
 
             path.unlink()
             if not stream_skipped: