diff --git a/libswscale/swscale_template.c b/libswscale/swscale_template.c
index a52dfd55d9..c7f278bb89 100644
--- a/libswscale/swscale_template.c
+++ b/libswscale/swscale_template.c
@@ -2109,9 +2109,9 @@ static inline void RENAME(rgb24ToUV_half)(uint8_t *dstU, uint8_t *dstV, uint8_t
     assert(src1==src2);
     for (i=0; i<width; i++)
     {
-        int r= src1[6*i + 0] + src1[6*i + 0];
-        int g= src1[6*i + 1] + src1[6*i + 1];
-        int b= src1[6*i + 2] + src1[6*i + 2];
+        int r= src1[6*i + 0] + src1[6*i + 3];
+        int g= src1[6*i + 1] + src1[6*i + 4];
+        int b= src1[6*i + 2] + src1[6*i + 5];
 
         dstU[i]= (RU*r + GU*g + BU*b + (257<<RGB2YUV_SHIFT))>>(RGB2YUV_SHIFT+1);
         dstV[i]= (RV*r + GV*g + BV*b + (257<<RGB2YUV_SHIFT))>>(RGB2YUV_SHIFT+1);