diff --git a/m4/faad.m4 b/m4/faad.m4
index f7c360409..833fa7ac4 100644
--- a/m4/faad.m4
+++ b/m4/faad.m4
@@ -186,5 +186,7 @@ if test x$enable_aac = xyes; then
 	CFLAGS=$oldcflags
 	LIBS=$oldlibs
 	CPPFLAGS=$oldcppflags
+else
+	enable_mp4=no
 fi
-])
\ No newline at end of file
+])