diff --git a/pulseaudio.c b/pulseaudio.c
index 7a791a0..ee08dbb 100644
--- a/pulseaudio.c
+++ b/pulseaudio.c
@@ -33,7 +33,7 @@ short int *buf = 0;
 int bufsize = 0;
 int bufpos = 0;
 
-void *open_dsp () {
+void *open_dsp (char *dummy) {
 	static int opened = 0;
 
 	/* with PA we only open the device once and then leave it
diff --git a/pulseaudio.h b/pulseaudio.h
index a915f88..fea4d0c 100644
--- a/pulseaudio.h
+++ b/pulseaudio.h
@@ -21,7 +21,7 @@ Street, Fifth Floor, Boston, MA  02110-1301, USA.
 #ifndef QRQ_PA
 #define QRQ_PA
 
-void *open_dsp (); 
+void *open_dsp (char *dummy);
 void write_audio (void *unused, int *in, int size);
 void close_audio (void *s);