diff --git a/Makefile b/Makefile
index 7663e4f..dacf5c0 100644
--- a/Makefile
+++ b/Makefile
@@ -59,7 +59,7 @@ build.compile:
 		--target=node20 \
 		--format=esm \
 		--tree-shaking=true \
-		--outfile=build/action.js
+		--outfile=build/action.mjs
 
 build.compile.verify:
-	test -f build/action.js
+	test -f build/action.mjs
diff --git a/build/action.js b/build/action.mjs
similarity index 100%
rename from build/action.js
rename to build/action.mjs