diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index ecb410310e700513338e08010a6decf20d84de61..7cd01b71b5bdc8e7573edfecd9bda4fd0f542230 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -297,10 +297,12 @@ struct tss_struct {
 	 */
 	unsigned long		io_bitmap[IO_BITMAP_LONGS + 1];
 
+#ifdef CONFIG_X86_32
 	/*
 	 * Space for the temporary SYSENTER stack:
 	 */
 	unsigned long		SYSENTER_stack[64];
+#endif
 
 } ____cacheline_aligned;