diff --git a/sdgym/synthesizers/realtabformer.py b/sdgym/synthesizers/realtabformer.py
index cf4e25e2..4b14e469 100644
--- a/sdgym/synthesizers/realtabformer.py
+++ b/sdgym/synthesizers/realtabformer.py
@@ -37,7 +37,7 @@ def _get_trained_synthesizer(self, data, metadata):
 
         with prevent_tqdm_output():
             os.environ["PYTORCH_ENABLE_MPS_FALLBACK"] = "1"
-            os.environ["PYTORCH_MPS_HIGH_WATERMARK_RATIO"] = "0.0"
+            os.environ["PYTORCH_MPS_HIGH_WATERMARK_RATIO"] = 0.0
             model = REaLTabFormer(model_type='tabular')
             model.fit(data, device='cpu')
             LOGGER.debug('PYTORCH_ENABLE_MPS_FALLBACK')
@@ -51,7 +51,7 @@ def _get_trained_synthesizer(self, data, metadata):
 
     def _sample_from_synthesizer(self, synthesizer, n_sample):
         """Sample synthetic data with specified sample count."""
-        os.environ["PYTORCH_MPS_HIGH_WATERMARK_RATIO"] = "0.0"
+        os.environ["PYTORCH_MPS_HIGH_WATERMARK_RATIO"] = 0.0
         os.environ["PYTORCH_ENABLE_MPS_FALLBACK"] = "1"
         LOGGER.debug('PYTORCH_ENABLE_MPS_FALLBACK')
         LOGGER.debug(os.getenv('PYTORCH_ENABLE_MPS_FALLBACK'))