diff --git a/interface/trmv.c b/interface/trmv.c
index 2e52527a3..029a83499 100644
--- a/interface/trmv.c
+++ b/interface/trmv.c
@@ -219,7 +219,10 @@ void CNAME(enum CBLAS_ORDER order, enum CBLAS_UPLO Uplo,
 
 #ifdef SMP
   nthreads = num_cpu_avail(2);
-
+  
+  if (n < 50 ) nthreads = 1;
+  if (nthreads > 2 && n < 500) nthreads = 2;
+	
   if (nthreads == 1) {
 #endif