diff --git a/interface/zher.c b/interface/zher.c
index 0d24984e60..49b1cec03b 100644
--- a/interface/zher.c
+++ b/interface/zher.c
@@ -177,7 +177,10 @@ void CNAME(enum CBLAS_ORDER order, enum CBLAS_UPLO Uplo, blasint n, FLOAT alpha,
   buffer = (FLOAT *)blas_memory_alloc(1);
 
 #ifdef SMP
-  nthreads = num_cpu_avail(2);
+  if (n < 100)
+    nthreads = 1;
+  else
+    nthreads = num_cpu_avail(2);
 
   if (nthreads == 1) {
 #endif
diff --git a/interface/zher2.c b/interface/zher2.c
index 1cae633ce0..eba4c4f41b 100644
--- a/interface/zher2.c
+++ b/interface/zher2.c
@@ -186,7 +186,10 @@ void CNAME(enum CBLAS_ORDER order, enum CBLAS_UPLO Uplo, blasint n, void *VALPHA
   buffer = (FLOAT *)blas_memory_alloc(1);
 
 #ifdef SMP
-  nthreads = num_cpu_avail(2);
+  if (n < 100)
+	nthreads = 1;
+  else
+    nthreads = num_cpu_avail(2);
 
   if (nthreads == 1) {
 #endif
diff --git a/interface/zhpr.c b/interface/zhpr.c
index 10507a71fa..34700549e3 100644
--- a/interface/zhpr.c
+++ b/interface/zhpr.c
@@ -175,7 +175,10 @@ void CNAME(enum CBLAS_ORDER order,
   buffer = (FLOAT *)blas_memory_alloc(1);
 
 #ifdef SMP
-  nthreads = num_cpu_avail(2);
+  if (n < 100)
+    nthreads = 1;
+  else
+    nthreads = num_cpu_avail(2);
 
   if (nthreads == 1) {
 #endif
diff --git a/interface/zhpr2.c b/interface/zhpr2.c
index c9bfb44b05..1cbaaa062b 100644
--- a/interface/zhpr2.c
+++ b/interface/zhpr2.c
@@ -187,7 +187,10 @@ void CNAME(enum CBLAS_ORDER order,
   buffer = (FLOAT *)blas_memory_alloc(1);
 
 #ifdef SMP
-  nthreads = num_cpu_avail(2);
+  if (n < 100)
+	nthreads = 1;
+  else
+    nthreads = num_cpu_avail(2);
 
   if (nthreads == 1) {
 #endif