diff --git a/torchbenchmark/util/model.py b/torchbenchmark/util/model.py
index d22dce661a..8e8176441f 100644
--- a/torchbenchmark/util/model.py
+++ b/torchbenchmark/util/model.py
@@ -187,8 +187,9 @@ def __post__init__(self):
                 or self.dargs.precision == "amp"
                 or self.dargs.precision == "int8-static"
                 or self.dargs.precision == "int8-dynamic"
-                or os.getenv("DNNL_DEFAULT_FPMATH_MODE").lower() == "any"
-                or os.getenv("DNNL_DEFAULT_FPMATH_MODE").lower() == "bf16"
+                or (os.getenv("DNNL_DEFAULT_FPMATH_MODE") != None and
+                   (os.getenv("DNNL_DEFAULT_FPMATH_MODE").lower() == "any" or
+                    os.getenv("DNNL_DEFAULT_FPMATH_MODE").lower() == "bf16"))
                 or (self.dynamo and self.opt_args.torchdynamo == "fx2trt")
                 or (not self.dynamo and self.opt_args.fx2trt)
                 or (not self.dynamo and self.opt_args.use_cosine_similarity)