diff --git a/libswscale/x86/ops_float.asm b/libswscale/x86/ops_float.asm
index 75ee0cf7f7..4f09ab846e 100644
--- a/libswscale/x86/ops_float.asm
+++ b/libswscale/x86/ops_float.asm
@@ -327,7 +327,7 @@ op dither%1
     IF COL(2),  mulps m14, %4
     IF COL(3),  mulps m15, %5
     IF COL(0),  addps %1, m12
-    IF NOP(0) && COL(4), addps %1, %3 ; first vector was not reused
+    IF NOP(0) && COL(4), addps %1, %2 ; first vector was not reused
     IF COL(1),  addps %1, m13
     IF NOP(1),  addps %1, %3
     IF COL(2),  addps %1, m14