diff --git a/electron-builder.yml b/electron-builder.yml
index f44c8a5de..f80ba206c 100644
--- a/electron-builder.yml
+++ b/electron-builder.yml
@@ -90,6 +90,10 @@ mac:
     NSCameraUsageDescription: ClawX requires camera access for video features
 
 dmg:
+  # Explicit volume size prevents dmg-builder@1.2.0 auto-calculation from
+  # underestimating (causes "No space left on device" for large app bundles).
+  # The final .dmg is bzip2-compressed, so this only affects the temp volume.
+  size: 2g
   background: resources/dmg-background.png
   icon: resources/icons/icon.icns
   iconSize: 100