diff --git a/ds_config_zero3.json b/ds_config_zero3.json
index ad0477c..d871067 100644
--- a/ds_config_zero3.json
+++ b/ds_config_zero3.json
@@ -12,6 +12,7 @@
     "offload_param":     { "device": "none" }
   },
   "fp16": { "enabled": true },
+  "bf16": { "enabled": false },
   "optimizer": {
     "type": "CPUAdam",
     "params": { "lr": 2e-5, "betas": [0.9, 0.999], "eps": 1e-8, "weight_decay": 0.1 }