diff --git a/arch/context.cc b/arch/context.cc
index 2289c7a..a98f70f 100644
--- a/arch/context.cc
+++ b/arch/context.cc
@@ -11,7 +11,7 @@ void prepareContext(void* tos, Context& context, void (*kickoff)(void*),
     ((uint64_t*)tos)[0] = (uint64_t)panic;
     ((uint64_t*)tos)[-1] = (uint64_t)kickoff;
     ((uint64_t*)tos)[-2] = (uint64_t)fake_systemv_abi;
-    context.rsp = (void*)(((uint64_t) tos)-24);
+    context.rsp = (void*)(((uint64_t) tos)-16);
     context.rbx = 0;
     context.rbp = 0;
     context.r12 = 0;