diff --git a/mace/core/runtime/opencl/opencl_runtime.cc b/mace/core/runtime/opencl/opencl_runtime.cc
index 331ae89677acf0cca5059c84ffe9bdfc0e913d01..01f370c51eb3a882d2c93fc5005e20e46d9b27f6 100644
--- a/mace/core/runtime/opencl/opencl_runtime.cc
+++ b/mace/core/runtime/opencl/opencl_runtime.cc
@@ -41,7 +41,7 @@ bool WriteFile(const std::string &filename,
 }  // namespace
 
 const std::string OpenCLErrorToString(cl_int error) {
-  switch(error) {
+  switch (error) {
     case CL_SUCCESS:
       return "CL_SUCCESS";
     case CL_DEVICE_NOT_FOUND: