diff --git a/java/dex.go b/java/dex.go
index db240fc..8363a7d 100644
--- a/java/dex.go
+++ b/java/dex.go
@@ -111,6 +111,8 @@
 	flagFiles = append(flagFiles, j.extraProguardFlagFiles...)
 	// TODO(ccross): static android library proguard files
 
+	flagFiles = append(flagFiles, android.PathsForModuleSrc(ctx, j.deviceProperties.Optimize.Proguard_flags_files)...)
+
 	r8Flags = append(r8Flags, android.JoinWithPrefix(flagFiles.Strings(), "-include "))
 	r8Deps = append(r8Deps, flagFiles...)