diff --git a/fsgen/fsgen_mutators.go b/fsgen/fsgen_mutators.go
index f6fe7c4..7b30264 100644
--- a/fsgen/fsgen_mutators.go
+++ b/fsgen/fsgen_mutators.go
@@ -68,6 +68,8 @@
 	moduleToInstallationProps map[string]installationProperties
 	// List of prebuilt_* modules that are autogenerated.
 	generatedPrebuiltEtcModuleNames []string
+	// Mapping from a path to an avb key to the name of a filegroup module that contains it
+	avbKeyFilegroups map[string]string
 }
 
 type installationProperties struct {
@@ -179,6 +181,7 @@
 			fsDepsMutex:                     sync.Mutex{},
 			moduleToInstallationProps:       map[string]installationProperties{},
 			generatedPrebuiltEtcModuleNames: generatedPrebuiltEtcModuleNames,
+			avbKeyFilegroups:                map[string]string{},
 		}
 
 		if avbpubkeyGenerated {