diff --git a/cmake/cudnn.cmake b/cmake/cudnn.cmake
index 69f40df51680a104c47d9335c070c570dcaff59a..2c84061ff572de4687b4d496f8ded6deee8d1011 100644
--- a/cmake/cudnn.cmake
+++ b/cmake/cudnn.cmake
@@ -2,7 +2,7 @@ if(NOT WITH_GPU)
     return()
 endif()
 
-set(CUDNN_ROOT "" CACHE PATH "CUDNN ROOT")
+set(CUDNN_ROOT "/usr" CACHE PATH "CUDNN ROOT")
 find_path(CUDNN_INCLUDE_DIR cudnn.h
     PATHS ${CUDNN_ROOT} ${CUDNN_ROOT}/include
     $ENV{CUDNN_ROOT} $ENV{CUDNN_ROOT}/include ${CUDA_TOOLKIT_INCLUDE}