diff --git a/visualc/src/include/ngspice/config.h b/visualc/src/include/ngspice/config.h
index c378057e0..323d278b1 100644
--- a/visualc/src/include/ngspice/config.h
+++ b/visualc/src/include/ngspice/config.h
@@ -5,8 +5,9 @@
 /* select major ngspice options */
 /* to undefine, replace #define by #undef and comment out */
 
-/* S parameter analysis */
-#define RFSPICE 1
+/* Define if you want soundfile (*.wav) support */
+#define HAVE_LIBSNDFILE
+#define HAVE_LIBSAMPLERATE
 
 /* Define if you want PSS analysis */
 #define WITH_PSS /**/
@@ -28,6 +29,9 @@
 /**********************************************************************/
 /********* Don't change entries found below ***************************/
 
+/* S parameter analysis */
+#define RFSPICE 1
+
 /* The xspice enhancements */
 #define XSPICE 1