diff --git a/paddle/fluid/platform/gpu_info.h b/paddle/fluid/platform/gpu_info.h
index 57962e6795cf531efcbf72e9e30e94d3013a27b8..36345e17406e22970806fa274d5a73a703517c43 100644
--- a/paddle/fluid/platform/gpu_info.h
+++ b/paddle/fluid/platform/gpu_info.h
@@ -23,9 +23,6 @@ limitations under the License. */
 namespace paddle {
 namespace platform {
 
-//! Environment variable: fraction of GPU memory to use on each device.
-const char kEnvFractionGpuMemoryToUse[] = "PADDLE_FRACTION_GPU_MEMORY_TO_USE";
-
 //! Get the total number of GPU devices in system.
 int GetCUDADeviceCount();