diff --git a/testsuites/mptests/mp03/task1.c b/testsuites/mptests/mp03/task1.c
index 1e5591279f..5fdda4d0f2 100644
--- a/testsuites/mptests/mp03/task1.c
+++ b/testsuites/mptests/mp03/task1.c
@@ -13,7 +13,7 @@
 
 #include "system.h"
 
-void Test_Task_Support(
+static void Test_Task_Support(
   uint32_t    node
 )
 {