diff --git a/src/tests/cpu/sb_cpu.c b/src/tests/cpu/sb_cpu.c
index 74116873..d9e5bde7 100644
--- a/src/tests/cpu/sb_cpu.c
+++ b/src/tests/cpu/sb_cpu.c
@@ -95,7 +95,7 @@ sb_event_t cpu_next_event(int thread_id)
 }
 
 /* helps to avoid compilers optimizing cpu_execute_event() away */
-static thread_local unsigned long long thread_count_primes;
+static TLS unsigned long long thread_count_primes;
 
 int cpu_execute_event(sb_event_t *r, int thread_id)
 {