diff --git a/pyopencl/characterize/__init__.py b/pyopencl/characterize/__init__.py
index 79bb9a7f28a81a0c49962a7e5f75d8b6499602af..be516c984399848a9c79f826aa90994a7dd05ea7 100644
--- a/pyopencl/characterize/__init__.py
+++ b/pyopencl/characterize/__init__.py
@@ -281,7 +281,7 @@ def get_simd_group_size(dev, type_size):
         pass
 
     lc_vendor = dev.platform.vendor.lower()
-    lc_real_vendor = dev.vendor.lower()
+    lc_dev_vendor = dev.vendor.lower()
     if "nvidia" in lc_vendor or "nvidia" in lc_real_vendor:
         return 32