diff --git a/fsgen/filesystem_creator.go b/fsgen/filesystem_creator.go
index 9aed460..fbe9078 100644
--- a/fsgen/filesystem_creator.go
+++ b/fsgen/filesystem_creator.go
@@ -263,7 +263,9 @@
 	}
 	partitionProps.Vbmeta_partitions = vbmetaPartitions
 
-	deviceProps := &filesystem.DeviceProperties{}
+	deviceProps := &filesystem.DeviceProperties{
+		Main_device: proptools.BoolPtr(true),
+	}
 	if bootloader, ok := f.createBootloaderFilegroup(ctx); ok {
 		deviceProps.Bootloader = proptools.StringPtr(":" + bootloader)
 	}