diff --git a/CMakeLists.txt b/CMakeLists.txt
index 24496f459c..ad78e441e8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -150,8 +150,8 @@ check_ipo_supported(RESULT IPO_FOUND)
 show_options()
 
 if(UNIX AND NOT APPLE AND NOT OPTION_DEDICATED)
-    if(NOT SDL_FOUND AND NOT SDL2_FOUND)
-        message(FATAL_ERROR "SDL or SDL2 is required for this platform")
+    if(NOT SDL_FOUND AND NOT SDL2_FOUND AND NOT ALLEGRO_FOUND)
+        message(FATAL_ERROR "SDL, SDL2 or Allegro is required for this platform")
     endif()
 endif()
 if(APPLE)