diff --git a/libavcodec/ra288.c b/libavcodec/ra288.c
index cfe2c9b736..72ed8102ee 100644
--- a/libavcodec/ra288.c
+++ b/libavcodec/ra288.c
@@ -181,22 +181,19 @@ static void co(int n, int i, int j, float *in, float *out, float *st1,
 
 static void update(Real288_internal *glob)
 {
-    int x,y;
     float buffer1[40], temp1[37];
     float buffer2[8], temp2[11];
 
-    y = glob->phase*5+5;
-    for (x=0;  x < 40; x++)
-        buffer1[x] = glob->output[(y++)%40];
+    memcpy(buffer1     , glob->output + 20, 20*sizeof(*buffer1));
+    memcpy(buffer1 + 20, glob->output     , 20*sizeof(*buffer1));
 
     co(36, 40, 35, buffer1, temp1, glob->st1a, glob->st1b, table1);
 
     if (pred(temp1, glob->st1, 36))
         colmult(glob->pr1, glob->st1, table1a, 36);
 
-    y = glob->phase + 1;
-    for (x=0; x < 8; x++)
-        buffer2[x] = glob->history[(y++) & 7];
+    memcpy(buffer2    , glob->history + 4, 4*sizeof(*buffer2));
+    memcpy(buffer2 + 4, glob->history    , 4*sizeof(*buffer2));
 
     co(10, 8, 20, buffer2, temp2, glob->st2a, glob->st2b, table2);