diff --git a/libavcodec/jpeg2000dsp.c b/libavcodec/jpeg2000dsp.c
index d183cbb87d..c746aed924 100644
--- a/libavcodec/jpeg2000dsp.c
+++ b/libavcodec/jpeg2000dsp.c
@@ -64,10 +64,10 @@ static void ict_int(void *_src0, void *_src1, void *_src2, int csize)
     int i;
 
     for (i = 0; i < csize; i++) {
-        i0 = *src0 + (((i_ict_params[0] * *src2) + (1 << 15)) >> 16);
+        i0 = *src0 + *src2 + (((26345 * *src2) + (1 << 15)) >> 16);
         i1 = *src0 - (((i_ict_params[1] * *src1) + (1 << 15)) >> 16)
                    - (((i_ict_params[2] * *src2) + (1 << 15)) >> 16);
-        i2 = *src0 + (((i_ict_params[3] * *src1) + (1 << 15)) >> 16);
+        i2 = *src0 + (2 * *src1) + (((-14942 * *src1) + (1 << 15)) >> 16);
         *src0++ = i0;
         *src1++ = i1;
         *src2++ = i2;