diff --git a/kernel/debug.cmake b/kernel/debug.cmake
index 01f225a3..0dfb5512 100644
--- a/kernel/debug.cmake
+++ b/kernel/debug.cmake
@@ -8,4 +8,5 @@ target_compile_definitions(moon PRIVATE OPEN_DEBUG)
 target_compile_definitions(moon PRIVATE REAP_DEBUG)
 target_compile_definitions(moon PRIVATE PCI_DEBUG)
 target_compile_definitions(moon PRIVATE DEVICE_REGISTRY_DEBUG)
+target_compile_definitions(moon PRIVATE FORK_DEBUG)
 target_compile_options(moon PRIVATE -fsanitize=undefined)