diff --git a/src/pixie/simd/avx2.nim b/src/pixie/simd/avx2.nim
index c702a4f..7bd9c9c 100644
--- a/src/pixie/simd/avx2.nim
+++ b/src/pixie/simd/avx2.nim
@@ -108,8 +108,8 @@ proc toPremultipliedAlphaAvx2*(data: var seq[ColorRGBA | ColorRGBX]) {.simd.} =
   let
     alphaMask = mm256_set1_epi32(cast[int32](0xff000000))
     shuffleControl = mm256_set_epi8(
-      15, 0, 15, 0, 11, 0, 11, 0, 7, 0, 7, 0, 3, 0, 3, 0,
-      15, 0, 15, 0, 11, 0, 11, 0, 7, 0, 7, 0, 3, 0, 3, 0
+      15, -1, 15, -1, 11, -1, 11, -1, 7, -1, 7, -1, 3, -1, 3, -1,
+      15, -1, 15, -1, 11, -1, 11, -1, 7, -1, 7, -1, 3, -1, 3, -1
     )
     oddMask = mm256_set1_epi16(0xff00)
     vec128 = mm256_set1_epi16(128)
@@ -390,8 +390,8 @@ proc blitLineNormalAvx2*(
     vec255 = mm256_set1_epi8(255)
     vecAlpha255 = mm256_set1_epi32(cast[int32]([0.uint8, 255, 0, 255]))
     shuffleControl = mm256_set_epi8(
-      15, 0, 15, 0, 11, 0, 11, 0, 7, 0, 7, 0, 3, 0, 3, 0,
-      15, 0, 15, 0, 11, 0, 11, 0, 7, 0, 7, 0, 3, 0, 3, 0
+      15, -1, 15, -1, 11, -1, 11, -1, 7, -1, 7, -1, 3, -1, 3, -1,
+      15, -1, 15, -1, 11, -1, 11, -1, 7, -1, 7, -1, 3, -1, 3, -1
     )
 
   var i: int
@@ -439,8 +439,8 @@ proc blitLineMaskAvx2*(
     div255 = mm256_set1_epi16(cast[int16](0x8081))
     vec255 = mm256_set1_epi8(255)
     shuffleControl = mm256_set_epi8(
-      15, 0, 15, 0, 11, 0, 11, 0, 7, 0, 7, 0, 3, 0, 3, 0,
-      15, 0, 15, 0, 11, 0, 11, 0, 7, 0, 7, 0, 3, 0, 3, 0
+      15, -1, 15, -1, 11, -1, 11, -1, 7, -1, 7, -1, 3, -1, 3, -1,
+      15, -1, 15, -1, 11, -1, 11, -1, 7, -1, 7, -1, 3, -1, 3, -1
     )
 
   var i: int