diff --git a/devlib/utils/version.py b/devlib/utils/version.py
index 15bf481..5e7b688 100644
--- a/devlib/utils/version.py
+++ b/devlib/utils/version.py
@@ -24,7 +24,7 @@ def get_commit():
     p.wait()
     if p.returncode:
         return None
-    if sys.version_info[0] == 3 and isinstance(std, str):
+    if sys.version_info[0] == 3 and isinstance(std, bytes):
         return std[:8].decode(sys.stdout.encoding, 'replace')
     else:
         return std[:8]