diff --git a/arch/x86/um/shared/sysdep/ptrace.h b/arch/x86/um/shared/sysdep/ptrace.h
index 5ef9344..2bbe1ec2 100644
--- a/arch/x86/um/shared/sysdep/ptrace.h
+++ b/arch/x86/um/shared/sysdep/ptrace.h
@@ -1,3 +1,6 @@
+#ifndef __SYSDEP_X86_PTRACE_H
+#define __SYSDEP_X86_PTRACE_H
+
 #ifdef __i386__
 #include "ptrace_32.h"
 #else
@@ -8,3 +11,5 @@
 {
 	return UPT_SYSCALL_RET(regs);
 }
+
+#endif /* __SYSDEP_X86_PTRACE_H */