diff --git a/src/shell.js b/src/shell.js
index 57eadea2f..e9306aa6c 100644
--- a/src/shell.js
+++ b/src/shell.js
@@ -27,7 +27,7 @@ async function execArgs(tag, file, args, options) {
     assert(Array.isArray(args));
     assert.strictEqual(typeof options, 'object');
 
-    debug(`${tag} exec: ${file}`);
+    debug(`${tag} exec: ${file} ${JSON.stringify(args)}`);
 
     const execOptions = Object.assign({ encoding: 'utf8', shell: false }, options);