--- a/include/neaacdec.h
+++ b/include/neaacdec.h
@@ -67,7 +67,7 @@
   #define NEAACDECAPI
 #endif
 
-#define FAAD2_VERSION "unknown"
+#define FAAD2_VERSION "2.9.1"
 
 /* object types for AAC */
 #define MAIN       1