diff --git a/driver/others/memory.c b/driver/others/memory.c
index be7450585..4493b7d71 100644
--- a/driver/others/memory.c
+++ b/driver/others/memory.c
@@ -422,6 +422,8 @@ This value is equal or large than blas_cpu_number. This means some threads are s
 */
 int blas_num_threads = 0;
 
+int blas_num_threads_set = 0;
+
 int  goto_get_num_procs  (void) {
   return blas_cpu_number;
 }
@@ -1994,6 +1996,8 @@ This value is equal or large than blas_cpu_number. This means some threads are s
 */
 int blas_num_threads = 0;
 
+int blas_num_threads_set = 0;
+
 int  goto_get_num_procs  (void) {
   return blas_cpu_number;
 }
diff --git a/driver/others/memory_qalloc.c b/driver/others/memory_qalloc.c
index 6174d9b75..0b38d1887 100644
--- a/driver/others/memory_qalloc.c
+++ b/driver/others/memory_qalloc.c
@@ -283,6 +283,7 @@ The numbers of threads in the thread pool.
 This value is equal or large than blas_cpu_number. This means some threads are sleep.
 */
 int blas_num_threads = 0;
+int blas_num_threads_set = 0;
 
 int  goto_get_num_procs  (void) {
   return blas_cpu_number;