diff --git a/paddle/fluid/operators/math/cross_entropy.cu b/paddle/fluid/operators/math/cross_entropy.cu
index a651e0265a0ebfaca50214aa5a59f674a18cf30c..cb200ec8d6ea533d546f3e01a16a48c88b14f677 100644
--- a/paddle/fluid/operators/math/cross_entropy.cu
+++ b/paddle/fluid/operators/math/cross_entropy.cu
@@ -28,7 +28,7 @@ __device__ __forceinline__ double real_log(double x) { return log(x); }
 
 __device__ __forceinline__ platform::float16 real_log(
     const platform::float16& val) {
-  return static_cast<platform::float16>(hlog(static_cast<half>(val)));
+  return static_cast<platform::float16>(logf(static_cast<float>(val)));
 }
 
 template <typename T>