diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index 61f2f8e..6351878 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -94,7 +94,7 @@
 	/* Set up the two "TSS" members which tell the CPU what stack to use
 	 * for traps which do directly into the Guest (ie. traps at privilege
 	 * level 1). */
-	pages->state.guest_tss.esp1 = cpu->esp1;
+	pages->state.guest_tss.sp1 = cpu->esp1;
 	pages->state.guest_tss.ss1 = cpu->ss1;
 
 	/* Copy direct-to-Guest trap entries. */