diff --git a/afsk/main.c b/afsk/main.c
index 18eb3bc3..8cf5dc4e 100644
--- a/afsk/main.c
+++ b/afsk/main.c
@@ -980,8 +980,8 @@ if (firstTime != ON)
 	  
   double time = (millis() - time_start)/1000.0;	  
   double Xi = 5.0 * sin(1.57) * sin(2.0 * 3.14 * time / 46.0);
-  double Yi = 5.0 * sin(1.57) * sin(2.0 * 3.14 * time / 46.0 + 3.14/2.0);
-  double Zi = 5.0 * cos(1.57 - 0.0) * sin(2.0 * 3.14 * time / 46.0 + 3.14);
+  double Yi = 5.0 * sin(1.57) * sin((2.0 * 3.14 * time / 46.0) + 3.14/2.0);
+  double Zi = 5.0 * cos(1.57 - 0.0) * sin((2.0 * 3.14 * time / 46.0) + 3.14);
 	  
   current[map[PLUS_X]] = ( Xi >= 0) ? Xi: 0;	 
   current[map[MINUS_X]] = ( Xi >= 0) ? 0: ((-1.0) * Xi);