diff --git a/bitsandbytes/cuda_specs.py b/bitsandbytes/cuda_specs.py
index 2a1d06daa..f9fdd295d 100644
--- a/bitsandbytes/cuda_specs.py
+++ b/bitsandbytes/cuda_specs.py
@@ -49,7 +49,7 @@ def get_cuda_version_string() -> Optional[str]:
     if version_tuple is None:
         return None
     major, minor = version_tuple
-    return f"{major * 10 + minor}"
+    return f"{major}{minor}"
 
 
 def get_cuda_specs() -> Optional[CUDASpecs]: