diff --git a/src/user.c b/src/user.c
index 77f0a58..3197c04 100644
--- a/src/user.c
+++ b/src/user.c
@@ -121,6 +121,9 @@ static int convert_support_fourcc(int fourcc)
 	switch (fourcc)
 	{
 		case FOURCC('B','A','S','0'): /* Obsolete */
+#ifndef OLD_ADC_SUPPORT
+			return 0;
+#endif
 		case FOURCC('B','A','S','E'):
 			return feature_base;