diff --git a/target-sparc/helper.c b/target-sparc/helper.c
index 6aca8fdcce..f222e3a2c0 100644
--- a/target-sparc/helper.c
+++ b/target-sparc/helper.c
@@ -38,7 +38,7 @@ static int cpu_sparc_find_by_name(sparc_def_t *cpu_def, const char *cpu_model);
 
 /* thread support */
 
-spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
+static spinlock_t global_cpu_lock = SPIN_LOCK_UNLOCKED;
 
 void cpu_lock(void)
 {