diff --git a/src/internal/task/task_stack_cortexm.c b/src/internal/task/task_stack_cortexm.c
index 8580fdbf..a14513d2 100644
--- a/src/internal/task/task_stack_cortexm.c
+++ b/src/internal/task/task_stack_cortexm.c
@@ -1,3 +1,4 @@
+//go:build scheduler.tasks && cortexm
 #include <stdint.h>
 
 uintptr_t SystemStack() {
@@ -9,4 +10,4 @@ uintptr_t SystemStack() {
         : "memory"
     );
     return sp;
-}
\ No newline at end of file
+}