diff --git a/java/dex.go b/java/dex.go
index 21a5926..055d479 100644
--- a/java/dex.go
+++ b/java/dex.go
@@ -135,6 +135,7 @@
 		"$r8Template": &remoteexec.REParams{
 			Labels:          map[string]string{"type": "compile", "compiler": "r8"},
 			Inputs:          []string{"$implicits", "${config.R8Jar}"},
+			OutputFiles:     []string{"${outUsage}"},
 			ExecStrategy:    "${config.RER8ExecStrategy}",
 			ToolchainInputs: []string{"${config.JavaCmd}"},
 			Platform:        map[string]string{remoteexec.PoolKey: "${config.REJavaPool}"},