diff --git a/cmake/flags.cmake b/cmake/flags.cmake
index 351af42ee6f6ad4f546c7fce2a2fc54d4292655e..e2fdfb5c46a50dee2e02ff74329217bbda5e3b08 100644
--- a/cmake/flags.cmake
+++ b/cmake/flags.cmake
@@ -8,7 +8,7 @@ include(CheckCXXSymbolExists)
 # is_c: is C flag or C++ flag, bool type.
 # src_list: The list name which the flag name will be append to.
 # flag_name: the flag name for compiler, such as '-Werror' '-Wall' etc
-# rest arguments: not used. 
+# rest arguments: not used.
 function(safe_set_flag is_c src_list flag_name)
     string(REPLACE "-" "_" safe_name ${flag_name})
     string(REPLACE "=" "_" safe_name ${safe_name})
@@ -44,7 +44,7 @@ CHECK_CXX_SYMBOL_EXISTS(UINT64_MAX "stdint.h" UINT64_MAX_EXISTS)
 if(NOT UINT64_MAX_EXISTS)
   set(CMAKE_REQUIRED_DEFINITIONS -D__STDC_LIMIT_MACROS)
   CHECK_CXX_SYMBOL_EXISTS(UINT64_MAX "stdint.h" UINT64_MAX_EXISTS_HERE)
-  if(UINT64_MAX_EXISTS_HERE) 
+  if(UINT64_MAX_EXISTS_HERE)
     set(CMAKE_REQUIRED_DEFINITIONS)
     add_definitions(-D__STDC_LIMIT_MACROS)
   else()
@@ -75,12 +75,13 @@ endforeach()
 # So, don't set these flags here.
 
 foreach(capability 30 35 50)
-    list(APPEND __arch_flags "-gencode arch=compute_${capability},code=sm_${capability}")
+    list(APPEND __arch_flags " -gencode arch=compute_${capability},code=sm_${capability}")
 endforeach()
 
+message(${__arch_flags})
 if (CUDA_VERSION VERSION_GREATER "7.0")
-    list(APPEND __arch_flags "-gencode arch=compute_52,code=sm_52")
+    list(APPEND __arch_flags " -gencode arch=compute_52,code=sm_52")
 endif()
 
-set(CUDA_NVCC_FLAGS ${__arch_flags} ${CUDA_NVCC_FLAGS})
 
+set(CUDA_NVCC_FLAGS ${__arch_flags} ${CUDA_NVCC_FLAGS})