diff --git a/zsnes/src/zmovie.c b/zsnes/src/zmovie.c
index 82242a45..e38f81f6 100644
--- a/zsnes/src/zmovie.c
+++ b/zsnes/src/zmovie.c
@@ -2162,9 +2162,9 @@ static void raw_video_write_frame()
         samples = RATE/50;
         if (freqtab[SoundQuality] & 1)
         {
-          static signed char odd_carry = 0;
-          samples += odd_carry-1;
-          odd_carry ^= 2;
+          static signed char half_carry = 0;
+          samples += half_carry;
+          half_carry ^= 1;
         }
       }
     }