diff --git a/rust/builder.go b/rust/builder.go
index 547d705..6326124 100644
--- a/rust/builder.go
+++ b/rust/builder.go
@@ -230,6 +230,8 @@
 		envVars = append(envVars, "OUT_DIR="+filepath.Join(outDirPrefix, moduleGenDir.String()))
 	}
 
+	envVars = append(envVars, "ANDROID_RUST_VERSION="+config.RustDefaultVersion)
+
 	if flags.Clippy {
 		clippyFile := android.PathForModuleOut(ctx, outputFile.Base()+".clippy")
 		ctx.Build(pctx, android.BuildParams{