diff --git a/CMakeLists.txt b/CMakeLists.txt
index bea79e2fe..e789c727a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -328,6 +328,7 @@ set(XRT_OXR_RUNTIME_SUFFIX monado CACHE STRING "OpenXR client library suffix")
 # cmake-format: on
 
 option(XRT_MODULE_MONADO_CLI "Build monado-cli" ON)
+option_with_deps(XRT_MODULE_MONADO_GUI "Build monado-gui" DEPENDS XRT_HAVE_SDL2)
 option(XRT_MODULE_AUX_VIVE "Build aux_vive" ON)
 
 # Most users won't touch these.
diff --git a/src/xrt/targets/CMakeLists.txt b/src/xrt/targets/CMakeLists.txt
index 91e6d77e7..844f605c4 100644
--- a/src/xrt/targets/CMakeLists.txt
+++ b/src/xrt/targets/CMakeLists.txt
@@ -15,7 +15,7 @@ if(XRT_MODULE_MONADO_CLI)
 	add_subdirectory(cli)
 endif()
 
-if(XRT_HAVE_SDL2)
+if(XRT_MODULE_MONADO_GUI)
 	add_subdirectory(gui)
 endif()