diff --git a/docs/source/examples/fully_featured_trainer.py b/docs/source/examples/fully_featured_trainer.py
index ad622fce5b..d4500b6656 100644
--- a/docs/source/examples/fully_featured_trainer.py
+++ b/docs/source/examples/fully_featured_trainer.py
@@ -190,7 +190,7 @@ if __name__ == '__main__':
     gpu_ids = hyperparams.gpus.split(';')
     if hyperparams.interactive:
         # run on 1 gpu
-        print(f'RUNNING INTERACTIVE MODE ON GPUS. gpu ids: {gpu_ids}')
+        print(f'RUNNING INTERACTIVE MODE ON GPUS. gpu ids: {str(gpu_ids)}')
         os.environ["CUDA_VISIBLE_DEVICES"] = gpu_ids
         main(hyperparams, None, None)