diff --git a/xtoskrnl/CMakeLists.txt b/xtoskrnl/CMakeLists.txt
index bab25a1..f6344a3 100644
--- a/xtoskrnl/CMakeLists.txt
+++ b/xtoskrnl/CMakeLists.txt
@@ -12,6 +12,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/ar/${ARCH}/globals.c
     ${XTOSKRNL_SOURCE_DIR}/ar/${ARCH}/procsup.c
     ${XTOSKRNL_SOURCE_DIR}/ar/${ARCH}/traps.c
+    ${XTOSKRNL_SOURCE_DIR}/ex/rundown.c
     ${XTOSKRNL_SOURCE_DIR}/hl/cport.c
     ${XTOSKRNL_SOURCE_DIR}/hl/efifb.c
     ${XTOSKRNL_SOURCE_DIR}/hl/globals.c