diff --git a/packages/cli/src/upload/upload.js b/packages/cli/src/upload/upload.js
index f969a4ba6..3c1860b17 100644
--- a/packages/cli/src/upload/upload.js
+++ b/packages/cli/src/upload/upload.js
@@ -512,7 +512,7 @@ function getFileOutputPath(pattern, context) {
   for (const match of matches) {
     const name = match.slice(2, -2).toLowerCase();
     const value = context[name] || 'unknown';
-    const sanitizedValue = value.replace(/[^a-z0-9]+/gi, '_');
+    const sanitizedValue = value.replace(/[^a-z0-9]+/gi, '_').replace(/^_/, '');
     filename = filename.replace(match, sanitizedValue);
   }