diff --git a/common_thread.h b/common_thread.h
index 0a4c703b7..06a7a1a38 100644
--- a/common_thread.h
+++ b/common_thread.h
@@ -53,7 +53,6 @@ extern void goto_set_num_threads(int nthreads);
 /* Global Parameter */
 extern int blas_cpu_number;
 extern int blas_num_threads;
-extern int blas_num_threads_set;
 extern int blas_omp_linked;
 
 #define BLAS_LEGACY	0x8000U