diff --git a/external/openal/CMakeLists.txt b/external/openal/CMakeLists.txt
index 3f91816..6662a2d 100644
--- a/external/openal/CMakeLists.txt
+++ b/external/openal/CMakeLists.txt
@@ -60,8 +60,3 @@ if (NOT DESKTOP_APP_USE_PACKAGED)
         AL_LIBTYPE_STATIC
     )
 endif()
-
-target_compile_definitions(external_openal
-INTERFACE
-    AL_ALEXT_PROTOTYPES
-)