diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 6140e11..373b478 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -538,8 +538,8 @@
 func copyBootJarsToPredefinedLocations(ctx android.ModuleContext, srcBootDexJarsByModule bootDexJarByModule, dstBootJarsByModule map[string]android.WritablePath) {
 	// Create the super set of module names.
 	names := []string{}
-	names = append(names, android.SortedStringKeys(srcBootDexJarsByModule)...)
-	names = append(names, android.SortedStringKeys(dstBootJarsByModule)...)
+	names = append(names, android.SortedKeys(srcBootDexJarsByModule)...)
+	names = append(names, android.SortedKeys(dstBootJarsByModule)...)
 	names = android.SortedUniqueStrings(names)
 	for _, name := range names {
 		src := srcBootDexJarsByModule[name]