diff --git a/index/sd/sdlada/sdlada-2.3.1.toml b/index/sd/sdlada/sdlada-2.3.1.toml
index 8cee6f61..6bfdadbf 100644
--- a/index/sd/sdlada/sdlada-2.3.1.toml
+++ b/index/sd/sdlada/sdlada-2.3.1.toml
@@ -11,6 +11,8 @@ project-files = ["build/gnat/sdlada.gpr"]
 libsdl2 = "^2.0"
 libsdl2_image = "^2.0"
 libsdl2_ttf = "^2.0"
+gnat = "/=2020" # Does not build yet with CE 2020
+
 [[actions."case(os)".linux]]
 type = "post-fetch"
 command = ["make", "-C", "build/gnat", "SDL_PLATFORM=linux", "SDL_MODE=release"]