diff --git a/src/xenia/cpu/backend/x64/x64_code_cache.cc b/src/xenia/cpu/backend/x64/x64_code_cache.cc
index ac05fe3e9..b258f2658 100644
--- a/src/xenia/cpu/backend/x64/x64_code_cache.cc
+++ b/src/xenia/cpu/backend/x64/x64_code_cache.cc
@@ -188,8 +188,9 @@ void* X64CodeCache::PlaceGuestCode(uint32_t guest_address, void* machine_code,
     std::memcpy(code_address, machine_code, code_size);
 
     // Fill unused slots with 0xCC
-    std::memset(code_address + code_size, 0xCC,
-                xe::round_up(code_size, 16) - code_size);
+    std::memset(
+        code_address + code_size, 0xCC,
+        xe::round_up(code_size + unwind_reservation.data_size, 16) - code_size);
 
     // Notify subclasses of placed code.
     PlaceCode(guest_address, machine_code, code_size, stack_size, code_address,