diff --git a/src/com/android/musicvis/vis4/vu.rs b/src/com/android/musicvis/vis4/vu.rs
index 816c846..2501cc9 100644
--- a/src/com/android/musicvis/vis4/vu.rs
+++ b/src/com/android/musicvis/vis4/vu.rs
@@ -36,7 +36,7 @@
 
 #define RSID_POINTS 1
 
-int root(int launchID) {
+int root(void) {
     rsgClearColor(0.f, 0.f, 0.f, 1.f);
 
     // Draw the visualizer.
diff --git a/src/com/android/musicvis/vis5/many.rs b/src/com/android/musicvis/vis5/many.rs
index 80920f2..ed3b792 100644
--- a/src/com/android/musicvis/vis5/many.rs
+++ b/src/com/android/musicvis/vis5/many.rs
@@ -258,7 +258,7 @@
 }
 
 
-int root(int launchID) {
+int root(void) {
     rsgClearColor(0.f, 0.f, 0.f, 1.f);
 
     rsgBindProgramVertex(gPVBackground);
diff --git a/src/com/android/musicvis/waveform.rs b/src/com/android/musicvis/waveform.rs
index a23a709..c3d75f2 100644
--- a/src/com/android/musicvis/waveform.rs
+++ b/src/com/android/musicvis/waveform.rs
@@ -84,7 +84,7 @@
     wave4amp++;
 }
 
-int root(int launchID) {
+int root(void) {
     rsgClearColor(0.f, 0.f, 0.f, 1.f);
 
     int i;