diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c
index 3fdcdba0fec5..429c0269dc4e 100644
--- a/arch/x86_64/kernel/signal.c
+++ b/arch/x86_64/kernel/signal.c
@@ -28,6 +28,7 @@
 #include <asm/uaccess.h>
 #include <asm/i387.h>
 #include <asm/proto.h>
+#include <asm/ia32_unistd.h>
 
 /* #define DEBUG_SIG 1 */