diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
index b112568..0534635 100644
--- a/filesystem/filesystem.go
+++ b/filesystem/filesystem.go
@@ -215,6 +215,9 @@
 
 	// Additional dependencies used for building android products
 	Android_filesystem_deps AndroidFilesystemDeps
+
+	// Name of the output. Default is $(module_name).img
+	Stem *string
 }
 
 type AndroidFilesystemDeps struct {
@@ -384,7 +387,7 @@
 }
 
 func (f *filesystem) installFileName() string {
-	return f.BaseModuleName() + ".img"
+	return proptools.StringDefault(f.properties.Stem, f.BaseModuleName()+".img")
 }
 
 func (f *filesystem) partitionName() string {