diff --git a/candle-kernels/src/cast.cu b/candle-kernels/src/cast.cu
index 42d04e80..ea611eba 100644
--- a/candle-kernels/src/cast.cu
+++ b/candle-kernels/src/cast.cu
@@ -27,7 +27,7 @@ extern "C" __global__ void FN_NAME( \
 #if __CUDA_ARCH__ >= 800
 CAST_OP(__nv_bfloat16, __nv_bfloat16, cast_bf16_bf16)
 
-CAST_OP(__nv_bfloat16, uint8_t, cast_bf16_u8)
+// CAST_OP(__nv_bfloat16, uint8_t, cast_bf16_u8)
 CAST_OP(__nv_bfloat16, uint32_t, cast_bf16_u32)
 // CAST_OP(__nv_bfloat16, __half,   cast_bf16_f16)
 CAST_OP(__nv_bfloat16, float,    cast_bf16_f32)