diff --git a/main.js b/main.js
index de21add..a09e214 100644
--- a/main.js
+++ b/main.js
@@ -96,7 +96,7 @@ async function main() {
 
       core.info(`Extracting tarball ${tarball_name}${tarball_ext}`);
 
-      const zig_parent_dir = tarball_ext === 'zip' ?
+      const zig_parent_dir = tarball_ext === '.zip' ?
         await tc.extractZip(tarball_path) :
         await tc.extractTar(tarball_path, null, 'xJ'); // J for xz