diff --git a/driver/level2/tpsv_U.c b/driver/level2/tpsv_U.c
index 763ea07b1..a0cfa8f6a 100644
--- a/driver/level2/tpsv_U.c
+++ b/driver/level2/tpsv_U.c
@@ -40,7 +40,11 @@
 #include <ctype.h>
 #include "common.h"
 
-int CNAME(BLASLONG m, FLOAT *a, FLOAT *b, BLASLONG incb, void *buffer){
+int
+#ifndef C_MSVC
+__attribute__((visibility("hidden")))
+#endif  
+      CNAME(BLASLONG m, FLOAT *a, FLOAT *b, BLASLONG incb, void *buffer){
 
   BLASLONG i;
   FLOAT *B = b;