diff --git a/test/helpers.py b/test/helpers.py
index 1d2bd857ee..15ee0c56a6 100644
--- a/test/helpers.py
+++ b/test/helpers.py
@@ -25,7 +25,7 @@ def assert_jit_cache_len(fxn, expected_len):
 def is_dtype_supported(dtype: DType, device: str = Device.DEFAULT):
   if dtype == dtypes.bfloat16:
     # NOTE: this requires bf16 buffer support
-    return device in {"RHIP", "HSA"} or (device == "CUDA" and not CI)
+    return device in {"RHIP", "HSA"} or (device == "CUDA" and not CI and not getenv("PTX"))
   if device in ["WEBGPU", "WEBGL"]: return dtype in [dtypes.float, dtypes.int32, dtypes.uint32]
   if device == "CUDA" and getenv("PTX") and dtype in (dtypes.int8, dtypes.uint8): return False
   # for CI GPU and OSX, cl_khr_fp16 isn't supported