diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2a81d698a..99305dd80 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -63,6 +63,7 @@ CMAKE_DEPENDENT_OPTION(AMD_K5 "AMD K5" ON "DEV_BRANCH" OFF)
 CMAKE_DEPENDENT_OPTION(CYRIX_6X86 "Cyrix 6x86" ON "DEV_BRANCH" OFF)
 CMAKE_DEPENDENT_OPTION(GUSMAX "Gravis UltraSound MAX" ON "DEV_BRANCH" OFF)
 CMAKE_DEPENDENT_OPTION(HEDAKA "Hedaka HED-919" ON "DEV_BRANCH" OFF)
+CMAKE_DEPENDENT_OPTION(I450KX "Intel i450KX" ON "DEV_BRANCH" OFF)
 CMAKE_DEPENDENT_OPTION(LASERXT "VTech Laser XT" ON "DEV_BRANCH" OFF)
 CMAKE_DEPENDENT_OPTION(MGA "Matrox Mystique graphics adapters" ON "DEV_BRANCH" OFF)
 CMAKE_DEPENDENT_OPTION(NO_SIO "Machines without emulated Super I/O chips" ON "DEV_BRANCH" OFF)