diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index b457f78b7dbf..cabdabce3cb2 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -557,7 +557,7 @@ restore:
 /*
  * Handle PTRACE_PEEKUSR calls for the debug register area.
  */
-unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
+static unsigned long ptrace_get_debugreg(struct task_struct *tsk, int n)
 {
 	struct thread_struct *thread = &(tsk->thread);
 	unsigned long val = 0;