diff --git a/doc/meson.build b/doc/meson.build
index f47c59a73..390e64ec9 100644
--- a/doc/meson.build
+++ b/doc/meson.build
@@ -22,9 +22,11 @@ endforeach
 foreach h : module_sources
   inputs += meson.source_root() / 'src' / 'modules' / h
 endforeach
-foreach h : media_session_sources
-  inputs += meson.source_root() / 'src' / 'examples' / h
-endforeach
+if is_variable('media_session_sources')
+  foreach h : media_session_sources
+    inputs += meson.source_root() / 'src' / 'examples' / h
+  endforeach
+endif
 inputs += meson.source_root() / 'test' / 'pwtest.h'
 
 # SPA headers use static inline functions. Doxygen doesn't extract those