diff --git a/optimum/exporters/tasks.py b/optimum/exporters/tasks.py
index 4dc5ce8ae33..3a9a751950e 100644
--- a/optimum/exporters/tasks.py
+++ b/optimum/exporters/tasks.py
@@ -1533,7 +1533,7 @@ def infer_library_from_model(
                     library_name = "transformers"
 
         if library_name is None:
-            ValueError(
+            raise ValueError(
                 "The library_name could not be automatically inferred. If using the command-line, please provide the argument --library (transformers,diffusers,timm)!"
             )