diff --git a/mace/kernels/reduce_mean.h b/mace/kernels/reduce_mean.h
index 71fc2de028e207249cc95c48d82699f77d6c353f..38d822e5730a5be345ba074523383dbe287bd2c0 100644
--- a/mace/kernels/reduce_mean.h
+++ b/mace/kernels/reduce_mean.h
@@ -110,7 +110,6 @@ struct ReduceMeanFunctor : ReduceFunctorBase {
       case 1:
         if (reduce_first_axis_) {
           T sum = 0;
-#pragma omp parallel for reduction(+:sum)
           for (int i = 0; i < data_reshape_[0]; ++i) {
             sum = sum + input_ptr[i];
           }