diff --git a/meson.build b/meson.build
index c9f96e7135d..7e8fee2ee2a 100644
--- a/meson.build
+++ b/meson.build
@@ -252,6 +252,7 @@ endif
 
 if host_machine.system() == 'darwin'
   with_dri_platform = 'apple'
+  pre_args += '-DBUILDING_MESA'
 elif ['windows', 'cygwin'].contains(host_machine.system())
   with_dri_platform = 'windows'
 elif system_has_kms_drm
diff --git a/scons/gallium.py b/scons/gallium.py
index 6d5b2fccc17..f208c638a0d 100755
--- a/scons/gallium.py
+++ b/scons/gallium.py
@@ -352,6 +352,7 @@ def generate(env):
                 '_DARWIN_C_SOURCE',
                 'GLX_USE_APPLEGL',
                 'GLX_DIRECT_RENDERING',
+                'BUILDING_MESA',
             ]
         else:
             cppdefines += [